how to do a for loop over the keys of array in php code example

Example 1: foreach in php

$arr = array(
	'key1' => 'val',
	'key2' => 'another',
	'another' => 'more stuff' 
);
foreach ($arr as $key => $val){
	//do stuff
}

//or alt syntax
foreach ($arr as $key => $val) :
   //do stuff here as well
endforeach;

Example 2: foreach ph

<?php
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
unset($value); // break the reference with the last element
?>