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run code in 300+ PHP versions simultaneously
<?php function Testing () { $array = array("1","2","3"); foreach ($array as $key => $value) { $values[] = $value; } return $values; } Testing(); var_dump($values);?>
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
Warning: Undefined variable $values in /in/FirZD on line 13 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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: values in /in/FirZD on line 13 NULL
Output for 7.3.32 - 7.3.33
NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Undefined variable: values in /in/FirZD on line 13 NULL

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277.74 ms | 402 KiB | 336 Q