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run code in 150+ php & hhvm versions
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<?php function isIBAN ($iban) { // Remove all whitespace $iban = preg_replace('/\s/', '', $iban); $iban = strtoupper($iban); if(strlen($iban) > 34) { return false; } // Create control number $alfa = str_split('ABCDEFGHIJKLMNOPQRSTUVWXYZ'); for($i = 1; $i < 27; ++$i) { $alfa_replace[] = $i + 9; } $controlNumber = str_replace($alfa, $alfa_replace, substr($iban, 4, strlen($iban)-4) . substr($iban, 0, 2) . "00"); $controlNumber = 98 - (int)bcmod($controlNumber, 97); return ((int)$controlNumber === (int)substr($iban, 2, 2)); } var_dump(isIBAN('999'));
Output for 5.0.0 - 5.4.45, 5.5.35, 5.6.21 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.6 - 7.1.0
bool(false)
Output for 7.0.0 - 7.0.5
Fatal error: Uncaught Error: Call to undefined function bcmod() in /in/cAPqU:19 Stack trace: #0 /in/cAPqU(23): isIBAN('999') #1 {main} thrown in /in/cAPqU on line 19
Process exited with code 255.
Output for 5.5.0 - 5.5.34, 5.6.0 - 5.6.20
Fatal error: Call to undefined function bcmod() in /in/cAPqU on line 19
Process exited with code 255.
Output for 4.4.5 - 4.4.9
<br /> <b>Fatal error</b>: Call to undefined function: str_split() in <b>/in/cAPqU</b> on line <b>14</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.4.4
<br /> <b>Fatal error</b>: Call to undefined function: str_split() in <b>/in/cAPqU</b> on line <b>14</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1
<br /> <b>Fatal error</b>: Call to undefined function: str_split() in <b>/in/cAPqU</b> on line <b>14</b><br />