Check if a string is an email address in PHP

Question

I am trying to do an SQL query, but I need to check somehow if the value is an email address. I need a way to check if $user is an email address, because I have user values such as this in my table.

test test2 [email protected] [email protected] test392 [email protected] 

and so on...

I need to make it so $useremail checks $user to find if it's an email address. So I can UPDATE the values, WHERE user=test OR [email protected], etc.

$user = strtolower($olduser); $useremail = "";  mysql_query("UPDATE _$setprofile SET user=$sn, fc=$fc WHERE user='$user' OR user='$useremail"); 

Answer 1

Without regular expressions:

<?php     if(filter_var("[email protected]", FILTER_VALIDATE_EMAIL)) {         // valid address     }     else {         // invalid address     } ?> 

Answer 2

This is not a great method and doesn't check if the email exists but it checks if it looks like an email with the @ and domain extension.

function checkEmail($email) {    $find1 = strpos($email, '@');    $find2 = strpos($email, '.');    return ($find1 !== false && $find2 !== false && $find2 > $find1); }  $email = '[email protected]'; if ( checkEmail($email) ) {    echo $email . ' looks like a valid email address.'; }