note 3587 deleted from function.sizeof by jimw

Remember, PHP code is interpreted so sizeof() is always evaluated in place and everytime. So a very simple code like below can blow up your server box (tested :) <? $arr= range(0,19); echo sizeof($arr)."<BR>"; for($i=0; $i<=sizeof($arr); $i++) { // <= is used intentionally $arr[$i] = ""; echo sizeof($arr)." Passing over #".$i."<BR>\n"; } ?> The assignment $arr[$i] when used in conjunction with <= in the for loop causes the assignment to add an extra element to the end of the array. So when the for-condition is next time checked when $i=20, sizeof($arr) will yield 21, the next time 22, and so on. So the program in fact starts to leak heavily and very rapidly. You can instead use: <? //... $c = sizeof($arr); for($i = 0; $i <= $c; $i++) { // <= is used intentionally again ... ?> This one will add the 21th element, but will stop then. No leak at all...