Online PHP editor | output for E6LT6

@ 2020-07-01T13:54:58Z

<?php

$data = [
    "1" => [
        "book" => "Harry Potter",
        "artist" => array("David", "Emma"),
        "country" => [
            ["description" => "Wander"],
            ["description" => "Magic"]
        ]
    ],
    "2" => [
        "book" => "Science book",
        "artist" => array("Artist 1", "Melanie Hudson"),
        "country" => [
            ["description" => "Physics"],
            ["description" => "Albert Einstein"]
        ]
    ],
    "3" => [
        "book" => "Bible",
        "artist" => array("Artist 1", "Pedro"),
        "country" => [
            ["description" => "Love"],
            ["description" => "Respect"]
        ]
    ],
];

$result = []; // $result is container for matches - filled by reference
$needle = 'Wander'; // the key we are looking for
recurse($data, $needle, $result);

function recurse($haystack = [], $needle = '', &$result) {
    foreach($haystack as $key => $value) {
        if(is_array($value)) {
            recurse($value, $needle, $result);
        } else {
            if(strpos($value, $needle) !== false) {
                $result[] = $value; // store match
            }
        }
    }
}

echo '<pre>'; var_dump($result); echo '</pre>';

Output for 8.4.1: Deprecated: recurse(): Optional parameter $haystack declared before required parameter $result is implicitly treated as a required parameter in /in/E6LT6 on line 34 Deprecated: recurse(): Optional parameter $needle declared before required parameter $result is implicitly treated as a required parameter in /in/E6LT6 on line 34 <pre>array(1) { [0]=> string(6) "Wander" } </pre>
Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14: Deprecated: Optional parameter $haystack declared before required parameter $result is implicitly treated as a required parameter in /in/E6LT6 on line 34 Deprecated: Optional parameter $needle declared before required parameter $result is implicitly treated as a required parameter in /in/E6LT6 on line 34 <pre>array(1) { [0]=> string(6) "Wander" } </pre>
Output for 8.0.0 - 8.0.30: Deprecated: Required parameter $result follows optional parameter $haystack in /in/E6LT6 on line 34 <pre>array(1) { [0]=> string(6) "Wander" } </pre>
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: <pre>array(1) { [0]=> string(6) "Wander" } </pre>

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