How to Check if an Array Element Contains Approved Values in PHP?

How to Verify the Presence of Approved Values within an Array Element

When dealing with arrays, it's often necessary to verify if a specific element contains a predetermined set of approved values. A common use case is checking for specific user inputs against a whitelist of acceptable options.

Solution:

To determine if an array element includes a value from a given list, you can utilize PHP's in_array function. By providing your array and the target value, in_array will return a boolean indicating if a match exists.

Here's an example:

<?php
// Suppose your array is $something ['say'] = 'bla'
$yourarray = ['say' => 'bla', 'say' => 'omg'];

// Checking if 'bla' is present in the array
if (in_array('bla', $yourarray)) {
    echo "The value 'bla' is present in the array.";
}
?>

Similarly, you can modify your code to include multiple approved values:

// Checking if 'bla' or 'omg' is present in the array
if (in_array('bla', $yourarray) || in_array('omg', $yourarray)) {
    echo "Either 'bla' or 'omg' is present in the array.";
}

By using the in_array function, you can effectively ensure that users submit data that adheres to your predefined requirements, enhancing the robustness and reliability of your applications.

The above is the detailed content of How to Check if an Array Element Contains Approved Values in PHP?. For more information, please follow other related articles on the PHP Chinese website!