A minimal E.164 normalizer for US/CA numbers — strips formatting, prepends "+1" if missing, and validates the digit count. For full international support, reach for giggsey/libphonenumber-for-php.
PHP
<?php
function normalizeUSPhone(string $input): ?string {
$digits = preg_replace('/\D+/', '', $input);
if (strlen($digits) === 10) {
return '+1' . $digits;
}
if (strlen($digits) === 11 && $digits[0] === '1') {
return '+' . $digits;
}
return null; // not a recognizable US/CA number
}
echo normalizeUSPhone('(512) 555-0199'); // +15125550199
echo normalizeUSPhone('1-512-555-0199'); // +15125550199
echo normalizeUSPhone('+15125550199'); // +15125550199
var_dump(normalizeUSPhone('12345')); // nullSave your own code snippets
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