Find all the values of a key in an array

This is a recursive PHP function that searches all of the keys in an array and pulls out their values.

function multi_array_key_search($needle,$haystack,$keys_found=array()){
	if(is_array($haystack)){
		foreach($haystack as $key=>$val){
			if(is_array($val)){
				$keys_found = multi_array_key_search($needle,$val,$keys_found);
			}else{
				if($key==$needle){
					$keys_found[] = $val;
				}
			}
		}
		return $keys_found;
	}
	return false;
}

Alternating background colors

I just wrote some pretty quick code for the age-old problem of alternating colors in a table. I don’t know how this could get any simpler. Sweet!

<? foreach($posts as $post){?>
	<div class="<?=($c++%2==1)?'odd':NULL?>">
		<?=$post?>
	</div>
<? }?>
<style>
	.odd{background-color:red;}
</style>

Forcing a floated line-wrap in PHP

For every 4 floated elements, wrap to the next line:
<?=($b++%4==0)?'<br class="clr" />':NULL?>