PHP 7 is (almost) here

45 RFCs

9,685 commits

180 contributors

It's faster: phpdoc

It's faster: typical blog

It's faster: Drupal 8

It's smaller: Drupal 8

It's better

PHP 5.6 is EOL on
August 28, 2017

PHP < 7 is EOL on
August 28, 2017

that's in 1 year, 11 months, 4 days

Distribution packages

Ubuntu 14.04: PHP 5.5.9, supported to April 2019

RHEL 7: PHP 5.4.16, supported to June 2024

BC theory

BC theory

Module and library authors

Module and library users

(also known as everyone)

Testing

Tooling

php7mar

phan

Try it!

Variable handling

Indirect references

$$foo['bar']['baz']
$foo->$bar['baz']
$foo->$bar['baz']()
Foo::$bar['baz']()
            

Why?

$foo()['bar']()
$foo::$bar::$baz
Foo::bar()()
(function() { ... })()
($obj->closure)()
[$obj, 'method']()
            

$$foo['bar']['baz'];
            

in PHP 5:

${$foo['bar']['baz']};
            

$$foo['bar']['baz'];
            

in PHP 7:

($$foo)['bar']['baz'];
            

$foo->$bar['baz']
            

in PHP 5:

$foo->{$bar['baz']}
            

$foo->$bar['baz']
            

in PHP 7:

($foo->$bar)['baz']
            

Foo::$bar['baz']()
            

in PHP 5:

Foo::{$bar['baz']}()
            

Foo::$bar['baz']()
            

in PHP 7:

(Foo::$bar)['baz']()
            

What do I do?

Foo::$bar['baz']()
            

Foo::$bar['baz']()
            

Using curly braces:

Foo::{$bar['baz']}()
            

Foo::$bar['baz']()
            

Break it down:

$method = $bar['baz'];
Foo::$method();
            

What do I look for?

Tooling

git grep -E '((((::)|(->))\$[a-zA-Z_][a-zA-Z0-9_]*)+\[[^\s]+\]\())|(->\$[a-zA-Z_][a-zA-Z0-9_]*\[)|(\$\$[a-zA-Z_][a-zA-Z0-9_]*\[)'
            

or with GNU grep:

grep -E '((((::)|(->))\$[a-zA-Z_][a-zA-Z0-9_]*)+\[[^\s]+\]\(\))|(->\$[a-zA-Z_][a-zA-Z0-9_]*\[)|(\$\$[a-zA-Z_][a-zA-Z0-9_]*\[)'
            

Engine exceptions

PHP 5

E_ERROR: 182
E_RECOVERABLE_ERROR: 17
E_PARSE: 1

PHP 7

E_ERROR: 54 (-128)
E_RECOVERABLE_ERROR: 3 (-14)
E_PARSE: 0 (-1)

function square(int $n): int {
  return $n * $n;
}

square('foo');
            

Fatal error: Uncaught TypeError:
Argument 1 passed to square() must
be of the type integer, string given
            

try {
  square('foo');
} catch (TypeError $e) {
  // Recover gracefully.
  // (or show a graceful error)
}
            

PHP 5

Exception
  LogicException
  RuntimeException
            

PHP 7

Throwable
  Error
    ParseError
    TypeError
    ...
  Exception
    LogicException
    RuntimeException
            

try {
  ...
} catch (Exception $e) {
  // Catch almost everything?
}
            

try {
  ...
} catch (Throwable $e) {
  // Catch everything, but is
  // that a good idea?
}
            

What do I do?

set_exception_handler

PHP 5

PHP 7

try {
  $code = '<?php echo 01090; ?>';
  highlight_string($code);
} catch (ParseError $e) {
  ...
}
            

Today

function log_exc(Exception $e) {
  ...
}

set_exception_handler('log_exc');
            

PHP 7 only

function log_exc(Throwable $e) {
  ...
}

set_exception_handler('log_exc');
            

PHP 5 and 7

function log_exc($e) {
  ...
}

set_exception_handler('log_exc');
            

What do I look for?

git grep set_exception_handler

git grep -E 'catch\s*\(\\?Exception\s'

foreach

(there are two)

$a = [1];
foreach ($a as &$v) {
  if ($v == 1) $a[] = 2;
  var_dump($v);
}
            

PHP 5:

int(1)
            

$a = [1];
foreach ($a as &$v) {
  if ($v == 1) $a[] = 2;
  var_dump($v);
}
            

PHP 7:

int(1)
int(2)
            

reset()
key()
current()
end()
next()
prev()
pos()

$a = range(1, 3);
foreach ($a as &$v) {
  var_dump(current($a));
}
            

PHP 5:

int(2)
int(3)
bool(false)
            

$a = range(1, 3);
foreach ($a as &$v) {
  var_dump(current($a));
}
            

PHP 7:

int(1)
int(1)
int(1)
            

What do I do?

Don't use the old array iteration functions

Use array_walk or array_map

array_walk($a, function (&$v, $k) {
  ...
});
            

$a = array_map(function ($v) {
  ...
}, $a);
            

Refactor

What do I look for?

git grep -E 'foreach.*\sas\s+&'
            

Hex strings are no longer numeric

function square($n) {
  return $n * $n;
}

echo square("0x10");
            

PHP 5:

  256
            

function square($n) {
  return $n * $n;
}

echo square("0x10");
            

PHP 7:

0
            

What do I do?

$n = sscanf('0x10', '%x')[0];
echo square($n);
            

What do I look for?

¯\_(ツ)_/¯

list() fails silently with string input

$s = 'abc';
list($a, $b, $c) = $s;
var_dump($a, $b, $c);
            

PHP 5:

string(1) "a"
string(1) "b"
string(1) "c"
            

$s = 'abc';
list($a, $b, $c) = $s;
var_dump($a, $b, $c);
            

PHP 7:

NULL
NULL
NULL
            

What do I do?

list($a, $b, $c) = str_split($s);
            

What do I look for?

¯\_(ツ)_/¯

yield

yield $foo or $bar;
            

in PHP 5:

yield ($foo or $bar);
            

yield $foo or $bar;
            

in PHP 7:

(yield $foo) or $bar;
            

What do I do?

What do I look for?

Sorting

$a = ['o', 'O'];
$opt = SORT_STRING|SORT_FLAG_CASE;
sort($a, $opt);

echo json_encode($a);
            

in PHP 5:

["O","o"]
            

$a = ['o', 'O'];
$opt = SORT_STRING|SORT_FLAG_CASE;
sort($a, $opt);

echo json_encode($a);
            

in PHP 7:

["o","O"]
            

What do I do?

What do I look for?

date.timezone

PHP 5

DateTime::__construct(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function.
...
            

PHP 7

bool
int
float
string
null
false
true
resource
object
mixed
numeric

$HTTP_RAW_POST_DATA
            

becomes:

file_get_contents('php://input');
            

ext/mysql is gone

(really)

function f() {
  global $$foo->bar;
}
            

Type declarations

Scalar types

function foo(int $a, string $b) {
  echo gettype($a).' '.gettype($b);
}
            

outputs:

integer string
            

Strict mode

<?php
declare(strict_types=1);
include 'foo.php'; // defines foo()
foo('0', 'foo');
            

outputs:

Fatal error: Uncaught TypeError: Argument
1 passed to foo() must be of the type
integer, string given, called in ...
            

Weak mode

<?php
include 'foo.php'; // defines foo()
foo('0', 'foo');
            

outputs:

integer string
            

Return types

function add(int $a, int $b): int {
  return $a + $b;
}
            

Return types

interface UserInterface {
  function getName(): string;
  function getEmail(): string;
  function login(string $pw): bool;
}
            

Null coalesce

Null coalesce

$a = isset($thing) ? $input : null;
$b = isset($stuff) ? $stuff : null;
$c = isset($brick) ? $brick : null;
            

Null coalesce

$a = $thing ?? null;
$b = $stuff ?? null;
$c = $brick ?? null;
            

<=>

Spaceship

usort($array, function ($a, $b) {
  return $a->id <=> $b->id;
});
            

SOON

Release candidates

Repositories

brew install php70

Ondřej Surý's DEBs

Remi Collet's RPMs