<?php $input="1234567890"; function format_phone_number($input) { $stripped = preg_replace('/[^0-9]/', '', $input); $len = strlen($stripped); if ($len === 10) { return '1' . $stripped; } if ($len === 11 && $stripped[0] === '1') { return $stripped; } } function validate_phone_number($input) { if (format_phone_number($input) == 11) { return true; } else { return false; } } if (validate_phone_number($input)) { echo "valid"; }; ?>
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