PHP - Checking the format of an email address

Here below you chould find sp techniques to determine if a variable contains a valid email address.

Using a filter

Using these type of fuction, you can check if email address is valid.

filter_var ()

Example:

if(filter_var($email, FILTER_VALIDATE_EMAIL)){

//Email is good

}

Using regular expressions

With regular expressions, it is possible to check if an email address, obtained via a form, is valid.

Here is a function that checks if a string is only an e-mail address valideunction VerifierAdresseMail ($ address)

function VerifyMailAddress($address)

{

$Syntax='#^[w.-]+@[w.-]+.[a-zA-Z]{2,5}$#';

if(preg_match($Syntaxe,$adrdess))

return true;

else

return false;

}

Implementation

After getting the address a form:

$address=htmlentities($_POST['adress']);

if(VerifyMailAddress($adress))

echo '

Your address is valid.

';

else

echo '

Your address is not valid.

';