PHP Array Exercises : Search a specified value within the values of an associative array

<?php
// Define a function named arraysearch that searches for a string in array values
function arraysearch($arra1, $search)
{
    // Reset the array pointer to the beginning
    reset($arra1);

    // Iterate through the array using a while loop
    while (list($key, $val) = each($arra1)) 
    {
        // Check if the search string is found (case-insensitive) in the current array value
        if (preg_match("/$search/i", $val)) 
        {
            // Display a message indicating the search string is found in the current key
            echo $search . " has found in " . $key . "\n";
        } 
        else 
        {
            // Display a message indicating the search string is not found in the current key
            echo $search . " has not found in " . $key . "\n";
        }
    }
}

// Define an associative array of exercises
$exercises = array("part1" => "PHP array", "part2" => "PHP String", "part3" => "PHP Math");

// Call the arraysearch function to search for "Math" in the values of the exercises array
arraysearch($exercises, "Math");

?>