increament and decreament loop in Javascript and php

//increment and decrements loop in Javascript
<script>
	// Decrements loop in JavaScript
	var Counter_array = Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,true,false),
	len = Counter_array.length;

 	for(var i = len; i > 0; i = i-1){
		window.document.write(i);
		window.document.write('<br />');
	}


	// Increment loop in JavaScript
	var Counter_array = Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,true,false),
	len = Counter_array.length;

 	for(var i = 0; i < len; i = i+1){
		window.document.write(i);
		window.document.write('<br />');
	}
</script>



// increment and decrements loop in php

// Decremented loop in php
<select>
<?php
for($i = 30;$i>=10;$i=$i-1){
	echo "<option value ='$i'>$i</option>";
}
?>

</select>



// increment  loop in php
<select>
<?php
for($i = 0;$i<=30;$i=$i+1){
	echo "<option value ='$i'>$i</option>";
}
?>

</select>