<? $values = array( '-0', -0, 0, 123, -123, '123', '-123', '0123', '123 ', '0', '000', '+123', '1.23', 1.23, '123e4', '0x123', 'potato', 'EEBD', false, null, ); foreach($values as $value){ echo("TRYING WITH "); var_dump($value); echo("is_int: "); var_dump(is_int($value)); echo("is_numeric: "); var_dump(is_numeric($value)); echo("regex: "); var_dump(preg_match('/^\-?[0-9]+$/',$value)); echo("ctype_digit: "); var_dump(ctype_digit(ltrim((string)$value, '-'))); echo("filter_var: "); var_dump(filter_var($value, FILTER_VALIDATE_INT)); echo("\n"); echo("\n"); } ?>
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