PHP Utility Functions - Arrays

utils.php

<?php

function array_table_innerjoin(Array $leftArr, Array $rightArr, String $key) {
    $mergeArray = [];
    foreach($leftArr as $leftRow) {
        foreach($rightArr as $rightRow) {
            if(isset($leftRow[$key]) && isset($rightRow[$key]) && $leftRow[$key] == $rightRow[$key]) {
                $mergeArray[] = array_merge($leftRow, $rightRow);
            }
        }
    }
    return $mergeArray;
}