PHP For Absolute Beginners

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PHP For Absolute Beginners Matt Wiebe @mattwiebe wp.mattwie.be Design Engineer Automattic / WordPress.com

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PHP

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PHP

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PHP For people who may or may not know what that is.

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What is PHP?

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What is PHP? ★ The thing that makes WordPress work

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What is PHP? ★ The thing that makes WordPress work ★ The thing you should know a little bit about if you want to tweak a theme or plugin.

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What is PHP? ★ The thing that makes WordPress work ★ The thing you should know a little bit about if you want to tweak a theme or plugin. ★ PHP: Hypertext Preprocessor

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What is PHP? ★ The thing that makes WordPress work ★ The thing you should know a little bit about if you want to tweak a theme or plugin. ★ PHP: Hypertext Preprocessor ★ The easiest way to get started with programming.

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What is PHP?

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What is PHP?

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What is PHP?

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What is PHP?

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Why should I learn PHP?

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Why should I learn PHP? ★ It’s what makes WordPress sing and dance

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Why should I learn PHP? ★ It’s what makes WordPress sing and dance ★ It’s easy

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Why should I learn PHP? ★ It’s what makes WordPress sing and dance ★ It’s easy ★ It’s fun

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Why should I learn PHP? ★ It’s what makes WordPress sing and dance ★ It’s easy ★ It’s fun ★ It might turn a hobby into a career

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THE BASICS

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Variables

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Variables $my_string = 'bar';

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Variables $my_string = 'bar';

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Variables $my_string = 'bar'; // This is a comment. It is ignored.

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Variables $my_string = 'bar'; // This is a comment. It is ignored. $my_number = 3;

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Variables $my_string = 'bar'; // This is a comment. It is ignored. $my_number = 3; $my_array = array('one', 'two', 'ten');

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Variables $my_string = 'bar'; // This is a comment. It is ignored. $my_number = 3; $my_array = array('one', 'two', 'ten'); $my_boolean = true;

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Variables $my_string = 'bar'; // This is a comment. It is ignored. $my_number = 3; $my_array = array('one', 'two', 'ten'); $my_boolean = true; /* Now you've seen 4 types of data */

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Operations

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Operations $first_name = 'Matt'; $last_name = 'Wiebe';

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Operations $first_name = 'Matt'; $last_name = 'Wiebe'; // Concatenation $full_name = $first_name . ' ' . $last_name;

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Operations $my_age = 33; $my_nephews_age = 3;

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Operations $my_age = 33; $my_nephews_age = 3; // Simple numeric operations: +-*/ $age_difference = $my_age - $my_nephews_age;

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Comparisons

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Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt';

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Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt'; $my_name == $dans_name

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Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt'; $my_name == $dans_name;

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Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt'; $my_name == $dans_name; // false;

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Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt'; $my_name == $dans_name; // false; $my_name == $my_bosses_name;

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Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt'; $my_name == $dans_name; // false; $my_name == $my_bosses_name; // true;

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Comparisons $a == $b // Equal $a != $b // Not equal $a >= $b // $a greater than or equal to $b $a <= $b // $a less than or equal to $b $a > $b // $a greater than $b $a < $b // $a less than $b

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Comparisons $a == $b // Equal $a != $b // Not equal $a >= $b // $a greater than or equal to $b $a <= $b // $a less than or equal to $b $a > $b // $a greater than $b $a < $b // $a less than $b /* There are a lot more but that’s all we’ll cover now. */

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Using Comparisons if ( $a == $b ) { }

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Using Comparisons if ( $a == $b ) { }

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Using Comparisons if ( $a == $b ) { // do something }

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Using Comparisons if ( $a == $b ) { // do something } else { }

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Using Comparisons if ( $a == $b ) { // do something } else { // do something else }

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Functions

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Functions

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