CODEWITHSUNDEEP
phpformsvalidation
Lieutenant Dan
Lieutenant Dan

Reputation: 8274

How to use PHP to check form field for specific value?

How to use PHP to check form field for specific value?

The value '7' would need to be inserted or else the form field will be invalid; so invalid with all other numbers then 7.

if(empty($_POST['captcha']))
{
    $this->add_error("Did you solve the captcha?");
    $ret = false;
}

Works to check if any value -- but I need to specify, must be 7.

if(strlen($_POST['captcha']) =!7) // tried this but form completely died or disappeared
{
    $this->add_error("Did you solve the captcha?");
    $ret = false;
}

Upvotes: 0

Views: 1338

Answers (2)

Ja͢ck
Ja͢ck

Reputation: 173572

There are two things to note here:

  1. You shouldn't use empty() here, because "0" is considered empty as well and it seems like it could be the answer of an equation; use isset() instead to just check whether the value is part of the request.

  2. You're trying to check the length of $_POST['captcha'] instead of comparing its value.

So:

if (!isset($_POST['captcha']) || $_POST['captcha'] != 7) {
    $this->add_error('Did you solve the captcha?');
    $ret = false;
}

Upvotes: 2

John Conde
John Conde

Reputation: 219834

You have two problems:

=! should be !=. See comparison operators.

if(strlen($_POST['captcha']) != 7)

You also need to turn on error reporting.

Upvotes: 1

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