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<?php $b = null; var_dump(isset($a)); var_dump(isset($b)); var_dump($a==null); var_dump($b==null); var_dump($a===null); var_dump($b===null);
Output for 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(false) Warning: Undefined variable $a in /in/EN7YD on line 8 bool(true) bool(true) Warning: Undefined variable $a in /in/EN7YD on line 11 bool(true) bool(true)
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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
bool(false) bool(false) Notice: Undefined variable: a in /in/EN7YD on line 8 bool(true) bool(true) Notice: Undefined variable: a in /in/EN7YD on line 11 bool(true) bool(true)
Output for 7.3.32 - 7.3.33
bool(false) bool(false) bool(true) bool(true) bool(true) bool(true)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
bool(false) bool(false) Notice: Undefined variable: a in /in/EN7YD on line 8 bool(true) bool(true) Notice: Undefined variable: a in /in/EN7YD on line 11 bool(true) bool(true)

preferences:
231 ms | 402 KiB | 351 Q