note 91404 modified in function.is-int by danbrown

If you're concerned with speed, you can save yourself about 50% of the time it takes to check whether or not something is an integer pretty easily... Running through 10,000 iterations of each of the following 3 methods outputs fairly consistently... <?php $foo = is_int($i); // 0.0032429695129395 seconds $foo = ((int) $i) == $i; // 0.0020270347595215 seconds $foo = ((int) $i) === $i; // 0.001600980758667 seconds ?> So if you want the best performance and know you're not going to be passed a string that needs to be typed as an integer, use === to compare the type as well. --was-- If you're concerned with speed, you can save yourself about 50% of the time it takes to check whether or not something is an integer pretty easily... Running through 10,000 iterations of each of the following 3 methods outputs fairly consistently... <? $foo = is_int($i); // 0.0032429695129395 seconds $foo = ((int) $i) == $i; // 0.0020270347595215 seconds $foo = ((int) $i) === $i; // 0.001600980758667 seconds ?> So if you want the best performance and know you're not going to be passed a string that needs to be typed as an integer, use === to compare the type as well. http://php.net/manual/en/function.is-int.php