<?php function is_natural($val) { $val = (string)$val; return (bool)ctype_digit($val) && $val === (string)(int)$val && $val > 0; } var_dump(is_natural(15)); // true var_dump(is_natural(0)); // false var_dump(is_natural(-1)); // false var_dump(is_natural('5')); // true var_dump(is_natural('01')); // false var_dump(is_natural('1.5')); // false var_dump(is_natural('0x18')); // false
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