Implode assoc

index.php

<?php

/**
 * @param string|array
 * @param string|array
 * @param string
 */
function implodeAssoc($glue, $arr, $key = null)
{
    if (is_array($l)) {
        $key = $arr;
        $arr = $glue;
        $l = '';
    }
    
    $s = "";
    foreach($arr as $val) {
        if (!isset($val[$key])) continue;
        $s .= $val[$key] . $glue;
        
    }
     $s = rtrim($s, $glue);
    
    return $s;
}

// without glue
echo implodeAssoc([
	['text' => 'a'],
	['text' => 'b'],
	['text' => 'c'],
], 'text'); // abc

// with glue
echo implodeAssoc(',', [
	['id' => 1],
	['id' => 2],
	['id' => 3],
], 'id'); // 1,2,3