CODEWITHSUNDEEP
php
md_5
md_5

Reputation: 85

Check and see if $_POST contains a specific string PHP

Im currently trying to figure out how can you check and see if a $_POST['email'] contains a specific string using php.

I currently tried

}elseif(empty($_POST['email']) || !strpos('@gmail.com', $_POST['email'])) {

the output says that the strpos does not contain the ending, when it does. What am i currently doing wrong, or is there another way of doing this?

I only want people to be able to register with gmail, and not any other unknown email accounts for spam use.

Upvotes: 2

Views: 5869

Answers (2)

Funk Forty Niner
Funk Forty Niner

Reputation: 74217

You're probably best off using preg_match with the \b pattern match instead of strpos. Plus, strpos will match GMAIL should you not want uppercase letters, you would want to use stripos instead, that will match it as case-insensitive, an FYI.

Using strpos will match gmail.comm instead of the intended gmail.com, which I'm sure you don't want. Users could very well enter [email protected] and still be considered valid, something else I'm sure you don't want, which will fail in either trying to mail back, or using an auto-responder.

"The \b in the pattern indicates a word boundary, so only the distinct * word "web" is matched, and not a word partial like "webbing" or "cobweb"

This will not match @GMAIL.com or @GMAIL.comm but will match @gmail.com but not @gmail.comm

<?php
if(isset($_POST['submit'])) {

$contains = "@gmail.com";

$email = $_POST['email'];

// or use (as outlined below)
// if(isset($_POST['email']) && preg_match("/\b(@gmail.com)\b/", $_POST['email']))

    if(isset($_POST['email']) && preg_match("/\b($contains)\b/",$email )) {
        echo 'yey! gmail!';
    } else {
        echo 'invalid input!';
    }
}

?>

<form method="POST">
    <input type="text" name="email" />
    <input type="submit" name="submit" />
</form>

You can also just do the following, replacing what you're presently using:

if(isset($_POST['email']) && preg_match("/\b(@gmail.com)\b/", $_POST['email']))

Upvotes: 1

helllomatt
helllomatt

Reputation: 1339

If you would like to try something else, instead of strpos, you can do this:

if (empty($_POST['email'] || array_pop(explode('@', $email)) != "gmail.com") {
    // Do something if the email is empty or the domain is not "gmail.com"
}

Upvotes: 1

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