- array_keys: documentation ( source)
<?php
$array = array('id'=>array('1','2'),'post'=>array('tes','doang'));
$placeholders = array();
foreach($array as $column => $value) {
foreach ($value as $key => $value) {
$pkey = ':' . $column . $key;
$placeholders[$pkey] = $value;
}
}
$pkeys = array_keys($placeholders);
$value = $pkeys;