'callable' was implemented as a typehint in 5.4
New features
PHP 5.4.0 offers a wide range of new features:
- Support for traits has been added.
- Short array syntax has been added, e.g. $a = [1, 2, 3, 4]; or $a = ['one' => 1, 'two' => 2, 'three' => 3, 'four' => 4];.
- Function array dereferencing has been added, e.g. foo()[0].
- Closures now support $this.
- <?= is now always available, regardless of the short_open_tag php.ini option.
- Class member access on instantiation has been added, e.g. (new Foo)->bar().
- Class::{expr}() syntax is now supported.
- Binary number format has been added, e.g. 0b001001101.
- Improved parse error messages and improved incompatible arguments warnings.
- The session extension can now track the upload progress of files.
- Built-in development web server in CLI mode.
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User Contributed Notes 3 notes
Joris Berthelot ¶
6 years ago
PHP 5.4 also allows to use arrays in switch:
<?php
$foo = 1;
$bar = 2;
switch([$foo, $bar]) {
case [1, 2]:
echo 'case 1';
break;
case [2, 2]:
echo 'case 2';
break;
case [3, 4]:
echo 'case 3';
break;
}
// Will output "case 1"
?>
dave1010 at gmail dot com ¶
12 years ago
As of PHP 5.4, the CLI (using readline) no longer dies on fatal errors (for example calling undefined functions).
