Problem
How can I use php5 to verify that the input value is a valid email address? This code is now in use by me.
function isValidEmail($email){
$pattern = "^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$";
if (eregi($pattern, $email)){
return true;
}
else {
return false;
}
}
However, it displays a deprecated error. What can I do to resolve this problem? Please assist me.
Asked by learner
Solution #1
The filter var() method provides a variety of useful validation and sanitization options.
filter_var($email, FILTER_VALIDATE_EMAIL)
If you don’t want to update any of your code that relies on your function, simply follow these steps:
function isValidEmail($email){
return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}
Note: The deprecated ereg function family (POSIX Regex Functions) should be replaced with the preg function family for other usage (where you need Regex) (PCRE Regex Functions). There are a few differences, but reading the manual should enough.
Update 1: As @binaryLV pointed out:
This bug has already been fixed.
Update 2: Of course, this approach will validate bazmega@kapa as a genuine email address, since it is. On the Internet, however, you almost always want the email address to have a TLD: bazmega@kapa.com. As suggested in this blog post (link posted by @Istiaque Ahmed), you can augment filter_var() with a regex that will check for the existence of a dot in the domain part (will not check for a valid TLD though):
function isValidEmail($email) {
return filter_var($email, FILTER_VALIDATE_EMAIL)
&& preg_match('/@.+\./', $email);
}
As @Eliseo Ocampos pointed out, this issue only existed before to PHP 5.3; in that version, the regex was updated, and the check is now performed automatically, so you don’t have to.
Answered by kapa
Solution #2
See http://www.php.net/manual/en/function.ereg.php for more information. :
Answered by Sean Kelleher
Solution #3
Although this is an old post, I will share one of my solutions because no one has mentioned an issue here previously.
UTF-8 characters or special domain names like.live,.news, and others can be used in a new email address.
Also, I’ve discovered that certain email addresses are in Cyrillic, which means that regular regex or filter var() will always fail.
That’s why I devised a solution:
function valid_email($email)
{
if(is_array($email) || is_numeric($email) || is_bool($email) || is_float($email) || is_file($email) || is_dir($email) || is_int($email))
return false;
else
{
$email=trim(strtolower($email));
if(filter_var($email, FILTER_VALIDATE_EMAIL)!==false) return $email;
else
{
$pattern = '/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD';
return (preg_match($pattern, $email) === 1) ? $email : false;
}
}
}
This function works well in all situations and email formats.
Answered by Ivijan Stefan Stipić
Solution #4
This is something I constantly say:
function validEmail($email){
// First, we check that there's one @ symbol, and that the lengths are right
if (!preg_match("/^[^@]{1,64}@[^@]{1,255}$/", $email)) {
// Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
return false;
}
// Split it into sections to make life easier
$email_array = explode("@", $email);
$local_array = explode(".", $email_array[0]);
for ($i = 0; $i < sizeof($local_array); $i++) {
if (!preg_match("/^(([A-Za-z0-9!#$%&'*+\/=?^_`{|}~-][A-Za-z0-9!#$%&'*+\/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$/", $local_array[$i])) {
return false;
}
}
if (!preg_match("/^\[?[0-9\.]+\]?$/", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
$domain_array = explode(".", $email_array[1]);
if (sizeof($domain_array) < 2) {
return false; // Not enough parts to domain
}
for ($i = 0; $i < sizeof($domain_array); $i++) {
if (!preg_match("/^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$/", $domain_array[$i])) {
return false;
}
}
}
return true;
}
Answered by unbreak
Solution #5
Prior to email validation, you must first delete all illegal characters from the email.
//This will Remove all illegal characters from email
$email = filter_var($email, FILTER_SANITIZE_EMAIL);
After that, use the filter var() function to validate your email address.
filter_var($email, FILTER_VALIDATE_EMAIL)) // To Validate the email
For e.g.
<?php
$email = "john.doe@example.com";
// Remove all illegal characters from email
$email = filter_var($email, FILTER_SANITIZE_EMAIL);
// Validate email
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
echo $email." is a valid email address";
} else {
echo $email." is not a valid email address";
}
?>
Answered by mufazmi
Post is based on https://stackoverflow.com/questions/5855811/how-to-validate-an-email-in-php