How to Verify if an Array Element Value Matches a Whitelist in PHP?

Determining Array Element Values Against a Whitelist

Consider a scenario where you need to verify if a specific array element, such as $something['say'], contains a predetermined value from a whitelist. For instance, let's say $something['say'] must hold either 'bla' or 'omg'.

The PHP in_array function provides an efficient solution for this task. It takes two primary inputs:

• Value to Check: The potential value contained in $something['say'], such as 'bla'.
• Whitelist Array: An array containing the allowed values, like ['$yourarray' => ['bla', 'omg']]

By utilizing the in_array function with these parameters, you can conveniently determine if $something['say'] matches any value within the whitelist:

if (in_array("bla", $yourarray)) {
    echo "Contains bla";
}

This approach enables you to validate array element values against pre-established criteria, ensuring that they conform to your desired specifications.

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