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@ 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 git.master, git.master_jit, rfc.property-hooks: 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>

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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