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@ 2022-07-19T08:21:10Z

<?php

/**
 * Extract values from an array, and return the results
 * 
 * @param array             $array      The array to filter
 * @param callable|string   $callback   Function to filter the array with
 * 
 * @return array A new array containing the filtered elements
 */
function array_excise(array &$array, callable|string $callback): array {
    $result = [];
    if (!is_callable($callback)) {
        return $result;
    }
    foreach ($array as $key => $value) {
        if ($callback($value)) {
            $result[$key] = $value;
            unset($array[$key]);
        }
    }

    return $result;
}


$people = [
    ["name" => "Billy Jean", "filter" => false],
    ["name" => "Ronald Reagan", "filter" => true],
    ["name" => "Bill Clinton", "filter" => true],
    ["name" => "Michael Jackson", "filter" => false],
    ["name" => "Johnny Cash", "filter" => false],
];

$presidents = array_excise($people, function($p){ return $p["filter"]; });
var_export(compact(['people', 'presidents']));

echo "\n---\n";

$numbers = [
    [1, 1, 1],
    [1, 1, 0],
    [1, 0, 0],
    [0, 0, 0]
];
$noZeros = array_excise($numbers, 'array_product');
var_export(compact(['numbers', 'noZeros']));

Output for git.master, git.master_jit, rfc.property-hooks: array ( 'people' => array ( 0 => array ( 'name' => 'Billy Jean', 'filter' => false, ), 3 => array ( 'name' => 'Michael Jackson', 'filter' => false, ), 4 => array ( 'name' => 'Johnny Cash', 'filter' => false, ), ), 'presidents' => array ( 1 => array ( 'name' => 'Ronald Reagan', 'filter' => true, ), 2 => array ( 'name' => 'Bill Clinton', 'filter' => true, ), ), ) --- array ( 'numbers' => array ( 1 => array ( 0 => 1, 1 => 1, 2 => 0, ), 2 => array ( 0 => 1, 1 => 0, 2 => 0, ), 3 => array ( 0 => 0, 1 => 0, 2 => 0, ), ), 'noZeros' => array ( 0 => array ( 0 => 1, 1 => 1, 2 => 1, ), ), )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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