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run code in 300+ PHP versions simultaneously
<?php $string = '+1 (214) 662-2590'; $pattern = '/^[0-9,+]+$/i'; $strlen = strlen($string); $iterations = pow(2, $strlen); for ($i = 0; $i < $iterations; $i++) { $tmp_string = $string; $number = $i; $k = 1; while ($number) { if ($number % 2) $tmp_string = substr_replace($tmp_string, '', $strlen - $k, 1); $number = (int) ($number / 2); $k++; } if (preg_match($pattern, $tmp_string)) { var_dump($tmp_string); break; } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(12) "+12146622590"
preferences:
319 ms | 406 KiB | 401 Q