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<?php function isString($value) { return is_string($value); } $vBase = [ 'date' => function($value) { return (bool)preg_match('/^\d{2}\.\d{2}\.\d{4}$/', $value); }, 'string' => isString, ]; $dateVal[] = date('d.m.Y'); $dateVal[] = date('Y-m-d'); foreach ($dateVal as $date) { var_dump( [ 'value' => $date, 'isValidFormat' => $vBase['date']($date), ] ); } var_dump($vBase['string'](1));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "isString" in /in/EGf5r:11 Stack trace: #0 {main} thrown in /in/EGf5r on line 11
Process exited with code 255.

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