$var_num = "1"; $var_str = "Hello World"; var_dump( is_numeric($var_num), is_numeric($var_str) ); /* Output - bool(true) bool(false) */
<?php if (is_numeric("cake")) { echo "Yes"; } else { echo "No"; } ?>
<?php if (is_numeric(887)) { echo "Yes"; } else { echo "No"; } ?>