What's new in PHP 7.2

DECEMBER 19TH 2017 • PHP USERGROUP DRESDEN HOLGER WOLTERSDORF
WHAT'S NEW IN PHP 7.2

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HOLGER WOLTERSDORF
CIO • FATHER • HUSBAND • PHP DEV WITH ♥
github.com/hollodotme
@hollodotme

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RTFM
http://php.net/ChangeLog-7.php#7.2.0
http://php.net/migration72
#kThanksBye

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87 BUGS FIXED
2,967 CHANGED FILES
354,019 ADDITIONS
166,587 DELETIONS

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NEW FEATURES
NEW FUNCTIONS
NEW CONSTANTS
BC BREAKS
DEPRECATIONS
OTHER / OPTIMIZATIONS

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WHAT'S NEW IN PHP 7.2 • DECEMBER 19TH 2017 • PHP USERGROUP DRESDEN HOLGER WOLTERSDORF
OBJECT TYPE
6
class GrandMother
{
public function howAboutFood( object $child ) : void
{
echo "G: How about food?\nK: {$child!->getStatus()}\n";
}
public function feed( object $child ) : object
{
echo "G: I've got some cookies for you!\n";
return $child!->eat();
}
}
class Child
{
private $status = 'I am hungry!';
public function eat() : Child
{
echo "K: Mhh nom nom nom\n";
$this!->status = 'I am full up.';
return $this;
}
public function getStatus() : string
{
return $this!->status;
}
}
$kiddo = new Child();
$granny = new GrandMother();
$granny!->howAboutFood( $kiddo );
$fatKiddo = $granny!->feed( $kiddo );
$granny!->howAboutFood( $fatKiddo );

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OBJECT TYPE
7
class GrandMother
{
{
echo "G: How about food?\nK: {$child!->getStatus()}\n";
}
{
}
}
class Child
{
public function eat() : Child
{
echo "K: Mhh nom nom nom\n";
$this!->status = 'I am full up.';
return $this;
}
{
}
}
$kiddo = new Child();
$granny!->howAboutFood( $kiddo );
$fatKiddo = $granny!->feed( $kiddo );
$granny!->howAboutFood( $fatKiddo );
G: How about food?
K: I am hungry!
G: I've got some cookies for you!
K: Mhh nom nom nom
G: How about food?
K: I am full up.
OUTPUT:

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OBJECT TYPE
8
class GrandMother
{
{
echo "G: How about food?\nB: {$child!->getStatus()}\n";
}
{
}
}
class Baby
{
public function eat() : string
{
echo "B: Mhh nom nom nom\n";
return 'I want m`00´re""...';
}
{
}
}
$baby = new Baby();
$granny!->howAboutFood( $baby );
$fatBaby = $granny!->feed( $baby );
$granny!->howAboutFood( $fatBaby );

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OBJECT TYPE
9
class GrandMother
{
{
}
{
}
}
class Baby
{
{
}
{
}
}
$baby = new Baby();
G: What about food?
B: I am hungry!
B: Mhh nom nom nom
PHP Fatal error: Uncaught TypeError: Return value of GrandMother!::feed() must be an object, string returned
OUTPUT:

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OBJECT TYPE
10
class GrandMother
{
{
}
{
}
}
class Baby
{
{
}
{
}
}
$baby = new Baby();
G: What about food?
B: I am hungry!
B: Mhh nom nom nom
PHP Fatal error: Uncaught TypeError: Return value of GrandMother!::feed() must be an object, string returned
OUTPUT:

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OBJECT TYPE
11
๏ BUT REMEMBER:
๏ object has no meaningful interface
๏ Don't be lazy - define proper interfaces!
๏ Reasonable when you expect a non-scalar / non-array value  
e.g. for an instanceof check

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LOAD EXTENSIONS BY NAME
12
[redis]
extension="redis.so"
extension="redis.dll"
# OR
dl('redis.so'); # *nix
dl('redis.dll'); # win
[redis]
extension="redis"
# OR
dl('redis'); # *nix + win
PHP < 7.2 PHP ">= 7.2
Warning
This function dl() was removed from most SAPIs in PHP 5.3.0, and was removed from PHP-FPM in PHP 7.0.0.

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ABSTRACT METHOD OVERWRITE
13
class Lighter { }
class Match { }
interface CandleInterface
{
public function fireUp( Match $fireSupply );
}
abstract class Candle implements CandleInterface
{
abstract public function fireUp( Match $fireSupply );
}
final class TableCandle extends Candle
{
public function fireUp( Match $fireSupply )
{
echo "See the romance?\n";
}
}
interface CandleCollectionInterface extends CandleInterface
{
public function fireUp( $fireSupply ) : int;
}
abstract class CandleCollection extends Candle implements CandleCollectionInterface
{
abstract public function fireUp( $fireSupply ) : int;
}
final class FairyLights extends CandleCollection
{
public function fireUp( $fireSupply ) : int
{
return 42;
}
}
$tableCandle = new TableCandle();
$tableCandle!->fireUp( new Match() );
# !!---
$fairyLights = new FairyLights();
$firedUp = $fairyLights!->fireUp( new Lighter() );
printf( 'Our tree has %d burning candles.', $firedUp );
See the romance?
Our tree has 42 burning candles.
OUTPUT:

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class Lighter { }
class Match { }
{
}
{
}
{
{
}
}
{
}
{
}
{
{
return 42;
}
}
14
# !!---
See the romance?
OUTPUT:

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class Lighter { }
class Match { }
{
}
{
}
{
{
}
}
{
}
{
}
{
{
return 42;
}
}
15
# !!---
See the romance?
OUTPUT:
DECLARATIONS
MUST BE EQUAL

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class Lighter { }
class Match { }
{
}
{
}
{
{
}
}
{
}
{
}
{
{
return 42;
}
}
16
# !!---
See the romance?
OUTPUT:
DECLARATIONS
MUST BE EQUAL
DECLARATIONS
CAN BE EQUAL

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class Lighter { }
class Match { }
{
}
{
}
{
public function fireUp( $fireSupply ) : void
{
}
}
{
}
{
}
{
{
return 42;
}
}
17
# !!---
See the romance?
OUTPUT:
DECLARATIONS
MUST BE EQUAL
DECLARATIONS
CAN DIFFER

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class Lighter { }
class Match { }
{
}
{
}
{
public function fireUp( $fireSupply ) : void
{
}
}
{
}
{
}
{
{
return 42;
}
}
18
# !!---
See the romance?
OUTPUT:
DECLARATIONS
CAN DIFFER

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class Lighter { }
class Match { }
{
}
{
}
{
{
}
}
{
}
{
}
{
{
return 42;
}
}
19
# !!---
See the romance?
OUTPUT:
DECLARATIONS
CAN DIFFER

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class Lighter { }
class Match { }
{
}
{
}
{
{
}
}
{
}
{
}
{
{
return 42;
}
}
20
# !!---
See the romance?
OUTPUT:
DECLARATIONS
MUST BE EQUAL

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class Lighter { }
class Match { }
{
}
{
}
{
{
}
}
{
}
{
}
{
public function fireUp( Lighter $fireSupply ) : int
{
return 42;
}
}
21
# !!---
See the romance?
Fatal error: Declaration of
FairyLights!::fireUp(Lighter $fireSupply): int
must be compatible with
CandleCollection!::fireUp($fireSupply): int
OUTPUT:
DECLARATIONS
CANNOT DIFFER

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22
๏ REMEMBER:
๏ Increases eﬀort to understand the code.
๏ Don't be lazy - define proper interfaces!
๏ Interfaces are not entirely breakable.
๏ Overwriting methods still must maintain the contravariance for parameters  
and the covariance for return
๏ TL;DR: You can only widen input and restrict output - not vice-versa.

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PDO::DEBUGDUMPPARAMS()
23
$pdo = new \PDO(
'mysql:host=127.0.0.1;port=3306',
'root',
'root',
[
\PDO!::ATTR_EMULATE_PREPARES !=> true,
]
);
$statement = $pdo!->prepare(
'SELECT * FROM mysql.user
WHERE user = :user
LIMIT 1'
);
$statement!->execute( ['user' !=> 'root'] );
$statement!->debugDumpParams();
SQL: [51] SELECT * FROM mysql.user WHERE user = :user LIMIT 1
Params: 1
Key: Name: [5] :user
paramno=-1
name=[5] ":user"
is_param=1
param_type=2
PHP < 7.2
PHP ">= 7.2
Sent SQL: [52] SELECT * FROM mysql.user WHERE user = 'root' LIMIT 1
Params: 1
paramno=-1
name=[5] ":user"
is_param=1
param_type=2

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PDO::DEBUGDUMPPARAMS()
24
$pdo = new \PDO(
'mysql:host=127.0.0.1;port=3306',
'root',
'root',
[
\PDO!::ATTR_EMULATE_PREPARES !=> false,
]
);
$statement = $pdo!->prepare(
'SELECT * FROM mysql.user
WHERE user = :user
LIMIT 1'
);
$statement!->execute( ['user' !=> 'root'] );
Params: 1
paramno=-1
name=[5] ":user"
is_param=1
param_type=2
PHP < 7.2
PHP ">= 7.2
Params: 1
paramno=-1
name=[5] ":user"
is_param=1
param_type=2

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PDO::PARAM_STR_NATL
25
$pdo = new \PDO(
'mysql:host=127.0.0.1;port=3306',
'root',
'root',
[
\PDO!::MYSQL_ATTR_INIT_COMMAND
!=> 'SET NAMES UTF8;',
]
);
$statement = $pdo!->prepare( "SELECT :umlaut" );
$statement!->bindValue(
'umlaut',
'äüöÄÜÖ',
PDO!::PARAM_STR | PDO!::PARAM_STR_NATL
);
$statement!->execute();
echo "\nResult: " . $statement!->fetchColumn();
OUTPUT:
SQL: [14] SELECT :umlaut
Sent SQL: [22] SELECT N'äüöÄÜÖ'
Params: 1
Key: Name: [7] :umlaut
paramno=-1
name=[7] ":umlaut"
is_param=1
param_type=1073741826
Result: äüöÄÜÖ

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ARGON2 PASSWORD HASH ALGO
26
$options = [
!// number of KiB that should be consumed
!// (default values are 1!<<10, or 1024 KiB, or 1 MiB)
'memory_cost' !=> PASSWORD_ARGON2_DEFAULT_MEMORY_COST,
!// number of iterations of the hashing algorithm
!// (defaults to 2)
'time_cost' !=> PASSWORD_ARGON2_DEFAULT_TIME_COST,
!// number of parallel threads that will be used
!// (defaults to 2)
'threads' !=> PASSWORD_ARGON2_DEFAULT_THREADS,
];
echo password_hash( 'password', PASSWORD_ARGON2I, $options );
OUTPUT:
$argon2i$v=19$m=1024,t=2,p=2$VEluMktEUGZvZVRyakhRcQ$zA08nETLeMoOgo/dvqf1qMZyCMl4yz3U6vPtqiYpS48
| ARGON2 IS A KEY DERIVATION FUNCTION THAT WAS SELECTED AS THE WINNER OF THE PASSWORD HASHING COMPETITION IN JULY 2015.
| IT WAS DESIGNED BY ALEX BIRYUKOV, DANIEL DINU, AND DMITRY KHOVRATOVICH FROM UNIVERSITY OF LUXEMBOURG.

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PLEASE WELCOME TO THE PHP CORE
Sodium is a chemical element with symbol Na
libsodium is a Fork of NaCl (Natriumchlorid = Salt)
Modern crypto for 2017

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SODIUM PASSWORD HASHING
29
$password = 'password';
!// hash the password and return an ASCII string suitable for storage
$hashStr = sodium_crypto_pwhash_str(
$password,
SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE,
SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE
);
echo $hashStr, "\n";
if ( sodium_crypto_pwhash_str_verify( $hashStr, $password ) )
{
echo "Verification: Password is valid.\n";
}
else
{
}
sodium_memzero( $password ); # wipe the plaintext password from memory
OUTPUT:
$argon2id$v=19$m=65536,t=2,p=1$yF1wB5WDGe3ENYZ7GHZZuQ$e/GHZ6Yra0UqLvqnQpIdHS1tJX+FloKyTl3Hmf8FIFc
Verification: Password is valid.

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SODIUM PASSWORD HASHING
30
!// hash the password and return an ASCII string suitable for storage
$hashStr = sodium_crypto_pwhash_str(
$password,
);
echo $hashStr, "\n";
if ( sodium_crypto_pwhash_str_verify( $hashStr, $password ) )
{
}
else
{
echo "Verification: Password is invalid.\n";
}
sodium_memzero( $password ); # wipe the plaintext password from memory
OUTPUT:
$argon2id$v=19$m=65536,t=2,p=1$yF1wB5WDGe3ENYZ7GHZZuQ$e/GHZ6Yra0UqLvqnQpIdHS1tJX+FloKyTl3Hmf8FIFc
Verification: Password is valid.

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SODIUM AUTHENTICATED EN/DECRYPTION
31
function deriveKeyFromPassword( string $password, string $salt ) : string
{
$outLength = SODIUM_CRYPTO_SIGN_SEEDBYTES;
$seed = sodium_crypto_pwhash(
$outLength,
$password,
$salt,
);
return $seed;
}
function encrypt( string $plainText, string $password ) : string
{
$salt = random_bytes( SODIUM_CRYPTO_PWHASH_SALTBYTES );
$key = deriveKeyFromPassword( $password, $salt );
$nonce = random_bytes( SODIUM_CRYPTO_SECRETBOX_NONCEBYTES );
$cipherText = sodium_crypto_secretbox( $plainText, $nonce, $key );
return $salt . $nonce . $cipherText;
}
function decrypt( string $cipherText, string $password ) : string
{
$salt = substr(
$cipherText,
0,
SODIUM_CRYPTO_PWHASH_SALTBYTES
);
$nonce = substr(
$cipherText,
SODIUM_CRYPTO_PWHASH_SALTBYTES,
SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
);
$encryptedText = substr(
$cipherText,
+ SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
);
$plainText = sodium_crypto_secretbox_open(
$encryptedText,
$nonce,
$key
);
if ( false !!=== $plainText )
throw new \InvalidArgumentException( 'Bad cipher text' );
return $plainText;
}
$message = 'Ho-Ho-Ho';
$encrypted = encrypt( $message, $password );
var_dump( $encrypted );
$decrypted = decrypt( $encrypted, $password );
var_dump( $decrypted );

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SODIUM AUTHENTICATED EN/DECRYPTION
32
function deriveKeyFromPassword( string $password, string $salt ) : string
{
$outLength = SODIUM_CRYPTO_SIGN_SEEDBYTES;
$seed = sodium_crypto_pwhash(
$outLength,
$password,
$salt,
);
return $seed;
}
function encrypt( string $plainText, string $password ) : string
{
$salt = random_bytes( SODIUM_CRYPTO_PWHASH_SALTBYTES );
$nonce = random_bytes( SODIUM_CRYPTO_SECRETBOX_NONCEBYTES );
$cipherText = sodium_crypto_secretbox( $plainText, $nonce, $key );
return $salt . $nonce . $cipherText;
}
function decrypt( string $cipherText, string $password ) : string
{
$salt = substr(
$cipherText,
0,
);
$nonce = substr(
$cipherText,
SODIUM_CRYPTO_PWHASH_SALTBYTES,
SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
);
$encryptedText = substr(
$cipherText,
+ SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
);
$plainText = sodium_crypto_secretbox_open(
$encryptedText,
$nonce,
$key
);
if ( false !!=== $plainText )
throw new \InvalidArgumentException( 'Bad cipher text' );
return $plainText;
}
$message = 'Ho-Ho-Ho';
$encrypted = encrypt( $message, $password );
var_dump( $encrypted );
$decrypted = decrypt( $encrypted, $password );
var_dump( $decrypted );
string(64) "[BINARY DATA]"
string(8) "Ho-Ho-Ho"
OUTPUT:

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SODIUM IN PHP CORE
33
๏ TAKE-AWAYS:
๏ Password hashing is equivalent to password_hash() with Argon2
๏ (Authenticated) encryption is easy with sodium
๏ sodium is currently poorly documented on php.net (YOU CAN CHANGE THAT!)
๏ Have a look at:
๏ GitBook: https://www.gitbook.com/book/jedisct1/libsodium/details
๏ PHP examples: https://paragonie.com/book/pecl-libsodium
๏ Oﬀicial docs: https://download.libsodium.org/doc/

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WHAT ELSE...
34
# OLD: arrays
$array = [1, 2, 3,];
# NEW: grouped namespaces
use Foo\Bar\
{
Bar,
Baz,
Foo,
};
Read and write support for
encrypted archives has been added
(requires libzip 1.2.0).
The ZipArchive class now implements
the Countable interface.
The zip:"// stream now accepts a
'password' context option.
The proc_nice() function
is now supported on
Windows.

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NEW FUNCTIONS
NEW CONSTANTS
BC BREAKS
DEPRECATIONS
NEW FEATURES

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NEW FUNCTIONS
36
# Is the stream a file descriptor attached to a terminal?
var_dump( stream_isatty( STDIN ) );
var_dump( stream_isatty( STDOUT ) );
var_dump( stream_isatty( STDERR ) );
var_dump( stream_isatty( fopen( 'php:"//memory', 'rb' ) ) );
var_dump( stream_isatty( tmpfile() ) );
# Prints
bool(true)
bool(true)
bool(true)
bool(false)
bool(false)
CORE: stream_isatty() CORE: sapi_windows_vt100_support()
(づ｡◕‿‿◕｡)づ ¯\_(ツ)_/¯

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NEW FUNCTIONS
37
# Returns the integer object handle for the given object
$a = new \stdClass();
$b = new class { };
$c = function () { };
var_dump( spl_object_id( $a ) );
var_dump( spl_object_id( $b ) );
var_dump( spl_object_id( $c ) );
unset($b);
var_dump( spl_object_id( $b ) );
var_dump( spl_object_id( new \stdClass() ) );
# Prints
int(1)
int(2)
int(3)
int(1)
PHP Warning: spl_object_id() expects parameter 1 to be object, null given !!...
NULL
int(3)
int(1)
int(2) # reused
int(3)
SPL: spl_object_id()

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NEW FUNCTIONS
38
$xml = ""<<

"

"
"
EOT;
$dom = new \DOMDocument( '1.0', 'UTF-8' );
$dom!->loadXML( $xml );
$nodeList = $dom!->getElementsByTagName( 'WHAT' );
var_dump( $nodeList!->count() );
var_dump( $nodeList instanceof Countable );
# Prints
int(2)
bool(true)
DOM: DOMNodeList::count()
$xml = ""<<

"

"
"
EOT;
$dom = new \DOMDocument( '1.0', 'UTF-8' );
$dom!->loadXML( $xml );
$namedNodeMap = $dom!->getElementsByTagName( 'WHAT' )!->item(0);
var_dump( $namedNodeMap!->attributes!->count() );
var_dump( $namedNodeMap!->attributes instanceof Countable );
# Prints
int(2)
bool(true)
DOM: DOMNamedNodeMap::count()

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NEW CONSTANTS
BC BREAKS
DEPRECATIONS
NEW FUNCTIONS
NEW FEATURES

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NEW CONSTANTS (CORE)
40
๏ PHP_FLOAT_DIG 
Number of decimal digits that can be rounded into a float and back without precision loss.
๏ PHP_FLOAT_EPSILON 
Smallest representable positive number x, so that x + 1.0 != 1.0.
๏ PHP_FLOAT_MIN 
Smallest representable floating point number.
๏ PHP_FLOAT_MAX 
Largest representable floating point number.
๏ PHP_OS_FAMILY 
The operating system family PHP was built for. Either of 'Windows', 'BSD', 'Darwin', 'Solaris', 'Linux' or 'Unknown'.

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NEW CONSTANTS (FILE INFO)
41
๏ FILEINFO_EXTENSION 
Returns the file extension appropriate for a the MIME type detected in the file.  
For types that commonly have multiple file extensions, such as JPEG images,  
then the return value is multiple extensions separated by a forward slash e.g.: "jpeg/jpg/jpe/jfif".  
For unknown types not available in the magic.mime database, then return value is "???".

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NEW CONSTANTS (JSON)
42
๏ JSON_INVALID_UTF8_IGNORE 
Ignores invalid UTF-8 characters.
๏ JSON_INVALID_UTF8_SUBSTITUTE 
Substitutes invalid UTF-8 characters.
$string = "\xf8\xa1\xa1\xa1\xa1-A-valid-string";
var_dump( json_encode( $string, JSON_INVALID_UTF8_IGNORE ) );
var_dump( json_encode( $string, JSON_INVALID_UTF8_SUBSTITUTE ) );
# Prints
string(17) ""-A-valid-string""
string(47) ""\ufffd\ufffd\ufffd\ufffd\ufffd-A-valid-string""

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NEW CONSTANTS (PCRE)
43
$pattern = '/^(what)(\s+i)?(s)\s+(new)\s+(in)\s+(php72)$/';
$string = 'whats new in php72';
preg_match( $pattern, $string, $matches );
var_export( $matches );
preg_match(
$pattern, $string, $matches, PREG_UNMATCHED_AS_NULL
);
var_export( $matches );
PREG_UNMATCHED_AS_NULL
array (
0 !=> 'whats new in php72',
1 !=> 'what',
2 !=> '',
3 !=> 's',
4 !=> 'new',
5 !=> 'in',
6 !=> 'php72',
)
array (
0 !=> 'whats new in php72',
1 !=> 'what',
2 !=> NULL,
3 !=> 's',
4 !=> 'new',
5 !=> 'in',
6 !=> 'php72',
)
OUTPUT:

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BC BREAKS
DEPRECATIONS
NEW CONSTANTS
NEW FUNCTIONS
NEW FEATURES

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BC BREAKS
45
# number_format
var_dump( number_format( -0.01 ) );
# Prints
string(1) "0"
# in PHP < 7.2
string(2) "-0"
# array to object
$arr = [ 0 !=> 1 ];
$obj = (object)$arr;
var_dump(
$obj,
$obj!->{'0'}, # now accessible
$obj!->{0} # now accessible
);
# Prints
class stdClass#1 (1) {
public $0 !=> int(1)
}
int(1)
int(1)
# PHP < 7.2
object(stdClass)#1 (1) {
[0]!=> int(1)
}
NULL
NULL
# object to array
$obj = new class
{
public function !__construct()
{
$this!->{0} = 1;
}
};
$arr = (array)$obj;
var_dump(
$arr,
$arr[0], # now accessible
$arr['0'] # now accessible
);
# Prints
array(1) {
[0] !=> int(1)
}
int(1)
int(1)
# PHP < 7.2
array(1) {
["0"]!=> int(1)
}
NULL
NULL

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BC BREAKS
46
class Test
{
public function getClassName()
{
return get_class(null);
}
}
echo (new Test)!->getClassName();
# Prints
PHP Warning: get_class() expects
parameter 1 to be object, null given
# PHP < 7.2
Test
# counting non-countable types
var_dump(
count( 1 ),
count( 'abc' ),
count( new stdClass() ),
count( [ 1, 2 ] )
);
# Prints
PHP Warning: count(): Parameter must
be an array or an object that
implements Countable
int(1)
int(1)
int(1)
int(2)
# PHP < 7.2
int(1)
int(1)
int(1)
int(2)
# Improved SSL/TLS defaults
Protocol: tls:"// now defaults to
TLSv1.0 or TLSv1.1 or TLSv1.2
Protocol ssl:"// is an alias of tls:"//
STREAM_CRYPTO_METHOD_TLS_*
constants default to
TLSv1.0 or TLSv1.1 + TLSv1.2,
instead of TLSv1.0 only

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BC BREAKS
47
# gettype on closed resources
$resource = fopen(
'php:"//memory', 'rb'
);
var_dump( gettype( $resource ) );
fclose( $resource );
var_dump( gettype( $resource ) );
# Prints
string(8) "resource"
string(17) "resource (closed)"
# PHP < 7.2
string(8) "resource"
string(12) "unknown type"
Previously, using is_object() on the
"__PHP_Incomplete_Class class would
return FALSE. Now, TRUE will be
returned.
Unqualified references to undefined
constants will now generate an
E_WARNING (instead of an E_NOTICE). In
the next major version of PHP, they
will generate Error exceptions.
The officially supported, minimum
Windows versions are now Windows 7 and
Server 2008 R2.
The object name was previously soft-
reserved in PHP 7.0. This is now hard-
reserved, prohibiting it from being
used as a class, trait, or interface
name.
Support for NetWare has now been
removed. \o/
The bcmod() function no longer
truncates fractional numbers to
integers. As such, its behavior now
follows fmod(), rather than the %
operator.
For example bcmod('4', '3.5')
now returns 0.5 instead of 1.
The json_decode() function option,
JSON_OBJECT_AS_ARRAY, is now used if
the second parameter (assoc) is NULL.
Previously, JSON_OBJECT_AS_ARRAY was
always ignored.
Sequences generated by rand() and
mt_rand() for a specific seed may
differ from PHP 7.1 on 64-bit machines
(due to the fixing of a modulo bias
bug in the implementation).

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DEPRECATIONS
BC BREAKS
NEW CONSTANTS
NEW FUNCTIONS
NEW FEATURES

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DEPRECATIONS
49
# Undefined constants
var_dump(NONEXISTENT);
# Prints
PHP Warning: Use of undefined
constant NONEXISTENT - assumed
'NONEXISTENT' (this will throw an
Error in a future version of PHP)
string(11) "NONEXISTENT"
# PHP < 7.2
Notice: Use of undefined constant
NONEXISTENT - assumed 'NONEXISTENT'
string(11) "NONEXISTENT"
# assert with string argument
$a = 1;
var_dump( assert( '$a"==1' ) );
# Prints
PHP Deprecated: assert(): Calling
assert() with a string argument is
deprecated
bool(true)
# PHP < 7.2
bool(true)
# Magic autoload
function !__autoload( $classname )
{
echo $classname;
}
# Prints
PHP Deprecated: !__autoload() is
deprecated, use
spl_autoload_register() instead
# parse_str without 2nd argument
parse_str( 'test=this' );
# Prints
PHP Deprecated: parse_str(): Calling
parse_str() without the result
argument is deprecated
When the track_errors ini setting is
enabled, a $php_errormsg variable is
created in the local scope when a non-
fatal error occurs. Given that the
preferred way of retrieving such error
information is by using
error_get_last(), this feature has
been deprecated.
create_function():
Given the security issues of this
function (being a thin wrapper around
eval()), this dated function has now
been deprecated. The preferred
alternative is to use anonymous
functions.
each():
This function is far slower at
iteration than a normal foreach, and
causes implementation issues for some
language changes. It has therefore
been deprecated.
eval() "== evil!

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DEPRECATIONS
BC BREAKS
NEW CONSTANTS
NEW FUNCTIONS
NEW FEATURES

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OTHER CHANGES
51
The utf8_encode() and utf8_decode() functions have now been moved to the standard extension
as string functions, whereas before the XML extension was required for them to be
available.
The MCrypt extension has now been moved out of the core to PECL. Given the mcrypt library
has not seen any updates since 2007, its usage is highly discouraged. Instead, either the
OpenSSL or Sodium extension should be used.

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DEAD CODE ELIMINATION (DCE)
52
function test()
{
$a = 1;
return 0;
}
$ php -d opcache.optimization_level=-1 -d opcache.opt_debug_level=0x20000 script.php
# PHP 7.1
fn: (lines=2, args=0, vars=1, tmps=0)
L0: ASSIGN CV0($a) int(1)
L1: RETURN int(0)
# PHP 7.2
fn: (lines=1, args=0, vars=0, tmps=0)
L0: RETURN int(0)

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53
function foo( string $s1, string $s2, string $s3, string $s4 )
{
$x = ($s1 . $s2) . ($s3 . $s4);
$x = 0;
return $x;
}
PHP 7.1 PHP 7.2
foo: (lines=10, args=4, vars=5, tmps=3) foo: (lines=5, args=4, vars=4, tmps=3)
L0: CV0($s1) = RECV 1 L0: CV0($s1) = RECV 1
L4: T6 = CONCAT CV0($s1) CV1($s2) L4: RETURN int(0)
L5: T7 = CONCAT CV2($s3) CV3($s4)
L6: T5 = CONCAT T6 T7
L7: ASSIGN CV4($x) T5
L8: ASSIGN CV4($x) int(0)
L9: RETURN CV4($x)

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54
CraPHPy code executed even faster now!

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SWITCH-CASE OPTIMIZATION
55
$cc = 'no';
switch ( $cc )
{
case 'de':
echo 'Deutsch';
break;
case 'en':
echo 'English';
break;
case 'nl':
echo 'Nederlands';
break;
case 'no':
echo 'Norsk';
break;
default:
echo 'unknown';
break;
}
if ( $cc !!=== 'de' )
{
echo 'Deutsch';
}
else
{
if ( $cc !!=== 'en' )
{
echo 'English';
}
else
{
if ( $cc !!=== 'nl' )
{
echo 'Nederlands';
}
else
{
if ( $cc !!=== 'no' )
{
echo 'Norsk';
}
else
{
echo 'unknown';
}
}
}
}
PHP 7.1 PHP 7.2

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SWITCH-CASE OPTIMIZATION
56
$table = [ 'de' !=> 1, 'en' !=> 2, 'nl' !=> 3, 'no' !=> 4 ];
if ( gettype( $cc ) !!=== 'string' )
{
if ( array_key_exists( $cc, $table ) )
{
goto "jmp_{$table[$cc]}";
}
else
{
goto jmp_default;
}
}
else
{
!/* do original if/else if/else sequence !*/
}
jmp_1: echo "DEUTSCH"; goto end;
jmp_2: echo "English"; goto end;
jmp_3: echo "Nederlands"; goto end;
jmp_4: echo "Norsk"; goto end;
jmp_default: echo "unknown";
end:
๏ PSEUDO-CODE
๏ OPTIMIZATION APPLIES ONLY
IF ALL KEYS ARE EITHER
STRING OR INT

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GO GET YOU PHP 7.2 TODAY
http:"//php.net/downloads.php
MAC: brew install homebrew/php/php72-xdebug
 
WINDOWS: http:!//windows.php.net/download#php-7.2
DEBIAN:
$ add-apt-repository ppa:ondrej/php
# Update index
$ apt-get update
# Install php7.2-fpm with needed extensions
$ apt-get install php7.2-fpm php7.2-cli php7.2-common php7.2-opcache !!...

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THANK YOU!
github.com/hollodotme
@hollodotme / @F9T3ch
fortuneglobe.com
phpug-dresden.org
@phpugdd
HOLGER WOLTERSDORF
icehawk.github.io
speakerdeck.com/hollodotme
Slides available at:

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LINKS / REFERENCES
59
๏ PHP Migrating from PHP 7.1.x to PHP 7.2.x: http://php.net/migration72
๏ PHP 7.2.0 Release notes: http://php.net/ChangeLog-7.php#7.2.0
๏ PHP Downloads: http://php.net/downloads.php#v7.2.0
๏ Argon2 Algorithm Wikipedia: https://en.wikipedia.org/wiki/Argon2
๏ PHP in 2018 by Rasmus Lerdorf: http://talks.php.net/ruhr17#/
๏ Switch case optimization by Derick Rethans: https://derickrethans.nl/php7.2-switch.html
๏ PHP 7.2 news by Benjamin Cremer: https://talks.benjamin-cremer.de/phpugms_php72/#/
๏ PHP 7.2.1 Changelog: http://git.php.net/?p=php-
src.git;a=blob;f=NEWS;h=205e7ea9f90f7c4d4471ac0e7e70c50712815097;hb=refs/heads/PHP-7.2#l8
๏ Code for this talk: https://github.com/hollodotme/talk-preps/tree/master/whats-new-in-php72

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What's new in PHP 7.2

What's new in PHP 7.2

Holger Woltersdorf

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