How to validate an Email in PHP?
You can use the filter_var()
function, which gives you a lot of handy validation and sanitization options.
filter_var($email, FILTER_VALIDATE_EMAIL)
PHP Manual filter_var()
Available in PHP >= 5.2.0
If you don't want to change your code that relied on your function, just do:
function isValidEmail($email){
return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}
Note: For other uses (where you need Regex), the deprecated ereg
function family (POSIX Regex Functions) should be replaced by the preg
family (PCRE Regex Functions). There are a small amount of differences, reading the Manual should suffice.
Update 1: As pointed out by @binaryLV:
PHP 5.3.3 and 5.2.14 had a bug related to
FILTER_VALIDATE_EMAIL, which resulted in segfault when validating
large values. Simple and safe workaround for this is usingstrlen()
beforefilter_var()
. I'm not sure about 5.3.4 final, but it is
written that some 5.3.4-snapshot versions also were affected.
This bug has already been fixed.
Update 2: This method will of course validate bazmega@kapa
as a valid email address, because in fact it is a valid email address. But most of the time on the Internet, you also want the email address to have a TLD: bazmega@kapa.com
. As suggested in this blog post (link posted by @Istiaque Ahmed), you can augment filter_var()
with a regex that will check for the existence of a dot in the domain part (will not check for a valid TLD though):
function isValidEmail($email) {
return filter_var($email, FILTER_VALIDATE_EMAIL)
&& preg_match('/@.+\./', $email);
}
As @Eliseo Ocampos pointed out, this problem only exists before PHP 5.3, in that version they changed the regex and now it does this check, so you do not have to.
PHP email validation function
You can use filter_var
to validate the e-mail address:
if (!filter_var($address, FILTER_VALIDATE_EMAIL)) {
// invalid e-mail address
}
How can I validate email in this PHP contact form?
In the past I have used:
if(filter_var($email, FILTER_VALIDATE_EMAIL))
{
//send email
}
else
{
//show error
}
Source: https://www.php.net/manual/en/function.filter-var.php
PHP: Email validation and accepting email address from a certain domain
Php has an easy function to help you with checking if an email address is valid:
$isValid = filter_var($email, FILTER_VALIDATE_EMAIL);
To check if the email adress is a gmail address, the following would do the trick:
list ($user, $domain) = explode('@', $email);
$isGmail = ($domain == 'gmail.com');
PHP email validation
I suggest you use the FILTER_VALIDATE_EMAIL
filter:
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
//valid
}
You can also use its regular expression directly:
"/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD"
But in that case, if a bug is found in the regular expression, you'll have to update your program instead of just updating PHP.
Best email validation function in general and specific (college domain)?
This is what I use:
function check_email_address($email) {
// First, we check that there's one @ symbol, and that the lengths are right
if (!preg_match("/^[^@]{1,64}@[^@]{1,255}$/", $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;
}
EDIT Replaced depreciated ereg with preg_match for PHP 5.3 compliance
php email validation function does not get processed
filter_var returns true only if the provided $email is valid.
To check if the email is invalid, change the if statement of filter_var as following and it should work
//your code
if (!(filter_var($email, FILTER_VALIDATE_EMAIL))) {
$emailErr = "Email is invalid";
}
//your code
Worldwide email validation
In PHP you can use filter_var
. Example from the docs:
$email = filter_var('bob@example.com', FILTER_VALIDATE_EMAIL);
In this case, $email
will contain "bob@example.com". For an invalid email address, it will contain false
.
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