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Use PHP arrays
like a BOSS
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Carl Alexander
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@twigpress
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carlalexander.ca
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No content
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You use arrays a
LOT with WordPress
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You use loops a LOT
with these arrays
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Loops are easy to
overuse
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Makes your code
complex
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Makes your code
hard to read
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Makes your code
hard to test
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PHP has a ton of
array functions
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Relevant
concepts
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Array data type
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Concept of array in
computer science
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Used to store a
collection of values
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Each value stored at
a specific location
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Retrieved using an
index or key
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Arrays are also used
in mathematics
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with mathematical
functions
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Functional
programming
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Important with PHP
array functions
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Revolves around
functions
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Mathematical ones,
not PHP ones
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What’s special about
these functions?
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They always
take an input
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They always
return a value
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They also come in
two categories
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Higher-order
functions
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Accept functions as
arguments
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Anonymous functions
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Serve higher-order
functions
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Same as a string or
array data type
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PHP callables
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Defines a function
or method call
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Also known as a
callback
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They have three
different forms
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Array and string:
norm with WordPress
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Anonymous function:
new with PHP 5.3
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Same type of
functions as earlier
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We can do functional
programming!
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This is what we’ll use
to replace loops
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You can use the other
forms in your code
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Questions?
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Replacing loops
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When can you use
array functions?
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Not a definitive list
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Just a starting point
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Validating
array values
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Using a loop to
remove array values
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array();
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
$posts_with_valid_meta_key[] = $post;
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array();
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
$posts_with_valid_meta_key[] = $post;
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array();
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
$posts_with_valid_meta_key[] = $post;
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array();
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
$posts_with_valid_meta_key[] = $post;
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array();
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
$posts_with_valid_meta_key[] = $post;
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array();
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
$posts_with_valid_meta_key[] = $post;
}
}
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array_filter
function
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Filters the values
inside an array
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You pass it an array
and a callable
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Iterates through
each array value
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Callable decides if
value is kept or not
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Returns
filtered array
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Replacing loop
with array_filter
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key')
);
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key’
));
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key’
));
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key’
));
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key’
));
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key’
));
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key’
));
$posts_with_valid_meta_key = array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
);
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Questions?
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Generating
new arrays
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Using a loop to
create a new array
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$recent_posts = get_posts();
$recent_post_permalinks = array();
foreach ($recent_posts as $post) {
$recent_post_permalinks[] = get_post_permalink($post->ID);
}
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$recent_posts = get_posts();
$recent_post_permalinks = array();
foreach ($recent_posts as $post) {
$recent_post_permalinks[] = get_post_permalink($post->ID);
}
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$recent_posts = get_posts();
$recent_post_permalinks = array();
foreach ($recent_posts as $post) {
$recent_post_permalinks[] = get_post_permalink($post->ID);
}
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$recent_posts = get_posts();
$recent_post_permalinks = array();
foreach ($recent_posts as $post) {
$recent_post_permalinks[] = get_post_permalink($post->ID);
}
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$recent_posts = get_posts();
$recent_post_permalinks = array();
foreach ($recent_posts as $post) {
$recent_post_permalinks[] = get_post_permalink($post->ID);
}
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array_map
function
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Modifies an array
using a callable
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Each array value
passed to callable
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Callable applies
changes to it
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Returns
transformed array
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Replacing loop
with array_map
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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$recent_posts = get_posts();
$recent_post_permalinks = array_map(
function(WP_Post $post) {
return get_post_permalink($post->ID);
},
$recent_posts
);
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Transforming array
of posts into links
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Powerful concept
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Questions?
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Searching
an array
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Using a loop to get
an array value
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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$recent_posts = get_posts();
$longest_recent_post = null;
foreach ($recent_posts as $post) {
if (!$longest_recent_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_recent_post->post_content)
) {
$longest_recent_post = $post;
}
}
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array_reduce
function
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Shrinks an array to
a single value
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Compares array
values using callable
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More complex than
earlier callable
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Callable uses two
parameters
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Current return value
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Current array value
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Compare the two and
return one of them
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Replacing loop
with array_reduce
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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$recent_posts = get_posts();
$longest_recent_post = array_reduce(
$recent_posts,
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
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Questions?
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Searching for a
valid array value
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Combines two loops
from earlier
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Validates
array values
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But also finds the
longest post
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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Please don't do this
loop in practice!
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = null;
foreach ($posts_with_meta_key as $post) {
if (my_plugin_is_meta_key_valid($post->post_meta_key)) {
if (!$longest_post_with_valid_meta_key instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post_with_valid_meta_key->post_content)
) {
$longest_post_with_valid_meta_key = $post;
}
}
}
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Combining array
functions
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No new array
function!
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New concept:
function composition
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Used with functional
programming
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No content
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No need to create
large functions
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Make functions as
small as possible
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Compose multiple
functions together
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Composing
array functions
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$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 148
Slide 148 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 149
Slide 149 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 150
Slide 150 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 151
Slide 151 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 152
Slide 152 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 153
Slide 153 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 154
Slide 154 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 155
Slide 155 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 156
Slide 156 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 157
Slide 157 text
$posts_with_meta_key = get_posts(array(
'meta_key' => ‘post_meta_key'
));
$longest_post_with_valid_meta_key = array_reduce(
array_filter(
$posts_with_meta_key,
function(WP_Post $post) {
return my_plugin_is_meta_key_valid($post->post_meta_key);
}
),
function($longest_post, WP_Post $post) {
if (!$longest_post instanceof WP_Post
|| str_word_count($post->post_content) >
str_word_count($longest_post->post_content)
) {
return $post;
}
return $longest_post;
}
);
Slide 158
Slide 158 text
Questions?
Slide 159
Slide 159 text
Why do this?
Slide 160
Slide 160 text
Loops are familiar
Slide 161
Slide 161 text
Using array
functions isn’t
Slide 162
Slide 162 text
You won’t always
feel that way
Slide 163
Slide 163 text
You’ll get
better with time
Slide 164
Slide 164 text
Reduces
complexity
Slide 165
Slide 165 text
Improves
code quality
Slide 166
Slide 166 text
Prevents
technical debt
Slide 167
Slide 167 text
Questions?
Slide 168
Slide 168 text
Thank you!