note 130261 added to function.array-filter

Please note that the examples above will result into error "E_DEPRECATED: strlen(): Passing null to parameter #1 ($string) of type string is deprecated" on PHP 8.1.0 and above. <?php declare(strict_types=1); $array = array( 'null' => null, 'nullstring' => '', 'intzero' => 0, 'stringzero' => '0', 'false' => false, 'stringfalse' => 'false', ); // Removes null, null-string -- but also FALSE! $filtered1 = array_filter( $array, 'strlen' ); ?> In order to use strlen on an array with null values, add/use strval, see the example below: <?php declare(strict_types=1); $array = array( 'null' => null, 'nullstring' => '', 'intzero' => 0, 'stringzero' => '0', 'false' => false, 'stringfalse' => 'false', ); // Removes null, null-string -- but also FALSE! $filtered1 = array_filter( $array, function($v) { return strlen(strval($v)); } ); ?> ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.137 (proxied: 77.164.192.77) ---- Manual Page -- https://php.net/manual/en/function.array-filter.php Edit -- https://main.php.net/note/edit/130261 Del: integrated -- https://main.php.net/note/delete/130261/integrated Del: useless -- https://main.php.net/note/delete/130261/useless Del: bad code -- https://main.php.net/note/delete/130261/bad+code Del: spam -- https://main.php.net/note/delete/130261/spam Del: non-english -- https://main.php.net/note/delete/130261/non-english Del: in docs -- https://main.php.net/note/delete/130261/in+docs Del: other reasons-- https://main.php.net/note/delete/130261 Reject -- https://main.php.net/note/reject/130261 Search -- https://main.php.net/manage/user-notes.php