How to Determine if One Array Contains All Values of Another Array in PHP?

Determining Array Containment with Array_diff

Within the realm of programming, data structures play a crucial role in managing information. Arrays, being a common data structure, allow for storing and accessing elements sequentially. A fundamental task that arises in array manipulation is checking if one array contains all values present in another array. This query requires an efficient and elegant solution.

Consider the following situation: two arrays, $all and $search_this, are given. Our objective is to assess whether $all encompasses all the values found in $search_this.

<code class="php">$all = array(
    0 => 307,
    1 => 157,
    2 => 234,
    3 => 200,
    4 => 322,
    5 => 324
);
$search_this = array(
    0 => 200,
    1 => 234
);</code>

A Simple and Effective Approach Using Array_diff

The most straightforward solution leverages the PHP function array_diff. This function compares two arrays, returning an array containing elements present in the first array but not in the second array. If we call array_diff($search_this, $all), it will create an array consisting of values in $search_this that are absent in $all.

Now, to determine if $all contains all the values of $search_this, we simply check if the result of array_diff is empty. If the difference array is empty, it implies that $all contains all the values of $search_this, and we return true. Otherwise, we return false.

<code class="php">$containsAllValues = !array_diff($search_this, $all);</code>

This method is both concise and efficient, as it utilizes PHP's built-in array comparison functionality. By harnessing the inherent capabilities of the language, we can avoid implementing complex iteration or comparison algorithms ourselves.

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