- implode: documentation ( source)
<?php
$model = array("id","car1","car2","car3");
$cars=array("Volvo","BMW","Toyota");
$arrlength=count($cars);
$sql = array();
for($x=0;$x<$arrlength;$x++) {
$sql[$x] = $model[$x+1] . "='$cars[$x]'";
}
print implode(", ",$sql);
?>