How to Verify Whitelisted Values in Array Elements in PHP?

Verifying Whitelisted Values in Array Elements

When inspecting arrays in PHP, situations may arise where you need to ascertain whether a particular element adheres to a predetermined set of allowable values. Consider a scenario where an array element named 'say' must possess either the value 'bla' or 'omg'.

Solution:

The PHP in_array function provides an efficient solution for this task. It determines if a specified value is present within an array.

if (in_array("bla", $yourarray)) {
    echo "Array contains 'bla'";
}

In this instance, $yourarray represents the array in question (e.g., $something), and "bla" is the value we're testing for. If 'bla' is found in the array, the code will output "Array contains 'bla'"; otherwise, it will not execute any action.

You can further enhance this check to include multiple whitelisted values:

$whitelistedValues = ['bla', 'omg'];
if (in_array("bla", $whitelistedValues) || in_array("omg", $whitelistedValues)) {
    echo "Array contains a whitelisted value";
}

By utilizing in_array in this manner, you can efficiently validate whether an array element conforms to your specified whitelist criteria.

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