[PHP-NOTES] 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)); } );

?>
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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