voku\helper\EmailCheck::isValid()

Complexity

Conditions	22
Paths	39

Size

Total Lines	83
Code Lines	48

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	47
CRAP Score	22.0328

Importance

Changes	1
Bugs	0	Features	0

<?php
  public static function isValid($email, $useExampleDomainCheck = false, $useTypoInDomainCheck = false, $useTemporaryDomainCheck = false, $useDnsCheck = false)
  {
    if (
        !is_string($email) // must be a string
        ||
        strpos($email, ' ') !== false // no space allowed
        ||
        strlen($email) >= 320 // make sure string length is limited to avoid DOS attacks
    ) {
      return false;
    }

    $email = str_replace(array('.', '＠'), array('.', '@'), $email); // non-Latin chars are also allowed | https://tools.ietf.org/html/rfc6530
    if (
      (strpos($email, '@') === false)
      ||
      (strpos($email, '.') === false && strpos($email, ':') === false) // dot or colon is needed
    ) {
      return false;
    }

    if (!preg_match('/^(.*<?)(.*)@(.*)(>?)$/', $email, $parts)) {
      return false;
    } else {

      list($email, $localFirst, $localSecond, $domain) = $parts;

      if (
          function_exists('idn_to_ascii')
          &&
          UTF8::max_chr_width($email) <= 3 // check for unicode chars with more then 3 bytes
      ) {

        $localFirstTmp = idn_to_ascii($localFirst);
        if ($localFirstTmp) {
          $localFirst = $localFirstTmp;
        }

        $domainTmp = idn_to_ascii($domain);
        if ($domainTmp) {
          $domain = $domainTmp;
        }

      } else {

        static $punycode = null;
        if ($punycode === null) {
          $punycode = new Punycode();
        }

        $localFirst = $punycode->encode($localFirst);
        $domain = $punycode->encode($domain);
      }

      $email = $localFirst . $localSecond . '@' . $domain . $parts[4];

      if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        return false;
      } else {
        $valid = true;
      }

      if ($useExampleDomainCheck === true && self::isExampleDomain($domain) === true) {
        return false;
      }

      if ($useTypoInDomainCheck === true && self::isTypoInDomain($domain) === true) {
        return false;
      }

      if ($useTemporaryDomainCheck === true && self::isTemporaryDomain($domain) === true) {
        return false;
      }

      if ($useDnsCheck === true && self::isDnsError($domain) === true) {
        return false;
      }

    }


    return $valid;
  }