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@ 2018-11-01T22:19:20Z

<?php


$firstArr  = [
    ['id' => 'old_id_1', 'color' => 'red'],
    ['id' => 'old_id_2', 'color' => 'blue'],
    ['id' => 'old_id_3', 'color' => 'green'],
    ['id' => 'old_id_4', 'color' => 'purple'],
    ['id' => 'old_id_5', 'color' => 'yellow'],
];
$secondArr = [
    ['id' => 'new_id_1', 'color' => 'blue'],
    ['id' => 'new_id_2', 'color' => 'pink'],
    ['id' => 'new_id_3', 'color' => 'purple'],
];

$firstArrAssoc = array_combine(array_column($firstArr, 'color'), array_column($firstArr, 'id'));
$duplicatesArr = [];
foreach ($secondArr as $row) {
    if (array_key_exists($row['color'], $firstArrAssoc)) {
        $duplicatesArr[] = "-  $row[color] ($row[id]) in {$firstArrAssoc[$row['color']]}";
    }
}
echo "We find " . count($duplicatesArr) . " duplicates colors :\n";
echo implode("\n", $duplicatesArr);

Output for git.master_jit, git.master, rfc.property-hooks: We find 2 duplicates colors : - blue (new_id_1) in old_id_2 - purple (new_id_3) in old_id_4

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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