<?php
$foo = null;
var_dump($foo === null);
var_dump(is_null($foo));
$bar = array('x' => 'x');
var_dump(isset($bar['x']));
var_dump(array_key_exists('x', $bar));
var_dump(isset($baz) ? $baz : null);
var_dump($baz);
- Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
- bool(true)
bool(true)
bool(true)
bool(true)
NULL
Warning: Undefined variable $baz in /in/07BVM on line 12
NULL
- Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
- bool(true)
bool(true)
bool(true)
bool(true)
NULL
Notice: Undefined variable: baz in /in/07BVM on line 12
NULL
- Output for 7.3.32, 7.4.26
- bool(true)
bool(true)
bool(true)
bool(true)
NULL
NULL
- Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
- bool(true)
bool(true)
bool(true)
bool(true)
NULL
Notice: Undefined variable: baz in /in/07BVM on line 12
NULL
preferences:
214.08 ms | 410 KiB | 5 Q