- ctype_digit: documentation ( source)
- is_numeric: documentation ( source)
- printf: documentation ( source)
<?php
foreach (['64a', '1.42', '-43b', '+45', '2.34e4', '64'] as $id){
printf("%6s: is_numeric: %6s; ctype_digit: %6s\r\n", $id, b(is_numeric($id)), b(ctype_digit($id)));
}
function b($b){
return $b?'true':'false';
}