Php validation of emailtel and other formats

Php validation of emailtel and other formats

function isValidEmail($email) {      $email = strtolower($email);     if (!preg_match(“/[^@]{1,64}@[^@]{1,255}/”, $email)) {          return false;      }      $email_array = explode(“@”, $email);      $local_array = explode(“.”, $email_array[0]);      $length = sizeof($local_array);      for ($i = 0; $i < $length; $i++) {          if (!preg_match(“@^[a-z0-9_~-][a-z0-9_~.-]{0,63}$@”, $local_array[$i])) {              return false;          }      }      unset($length);      if (!preg_match(“@^\[?[0-9\.]+\]?$@”, $email_array[1])) {          $domain_array = explode(“.”, $email_array[1]);          $length = sizeof($domain_array);          if ($length < 2) {              return false;          }          for ($i = 0; $i < $length; $i++) {              if (!preg_match(“/^(([a-z0-9][a-z0-9-]{0,61}[a-z0-9])|([a-z0-9]+))$/”, $domain_array[$i])) {                  return false;              }          }      unset($length);      }      return true;  } 

2. verify that the mobile phone is compliant with the standard function isValidCellPhone ($ cellPhone) {$ flag = FALSE; if (preg_match ('@ ^ 1 [3458] [0-9] {9 }$ @', $ cellPhone) {$ flag = TRUE;} return $ flag ;} 3. verify that the phone number complies with the standard function isValidPhone ($ phone) {if (preg_match ('@ ^ 1 [3458] [0-9] {9} $ @', $ phone )) {return true;} if (preg_match ('@((? :(? :(? : 00860? | 0 )(? : 10 | 2 \ d | [3-9] \ d ))-?)? ([2-8] \ d {6, 7}) @ ', $ phone) {return true;} if (preg_match (' @ ^ ([48] 00 (? : \ D {7} |-\ d {7} |-\ d {3}-\ d {4} |-\ d {4}-\ d {3} | \ d-\ d {3}-\ d {3 })) $ @ ', $ phone) {return true;} return false ;}