<?php
// given:
$undef = 'a';
unset($undef);
$null = NULL;
$false = FALSE;
$true = TRUE;
// these operations:
var_dump(isset($undef));
var_dump(empty($undef));
var_dump(array_key_exists('undef', $GLOBALS)); // "defined" below
- Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 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 - 5.6.28, 7.0.5 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- bool(false)
bool(true)
bool(false)
- Output for 7.0.0 - 7.0.4
- bool(false)
bool(true)
bool(true)
- Output for 5.1.0
- Fatal error: fatal flex scanner internal error--end of buffer missed in /in/j1lOE on line 13
Process exited with code 255.
preferences:
244.86 ms | 401 KiB | 367 Q