PHP Exercises: Get the index of the last element for which the given function returns a truth value

PHP: Exercise-82 with Solution

Write a PHP program to get the index of the last element for which the given function returns a truth value.

Sample Solution:

PHP Code:

<?php
// Function definition for 'find_last_Index' that takes an array of items and a filtering function as parameters
function find_last_Index($items, $func)
{
    // Use 'array_filter' to filter the items based on the given function and retrieve the keys of the filtered items
    $keys = array_keys(array_filter($items, $func));

    // Use 'array_pop' to retrieve and return the last key from the array of filtered keys
    return array_pop($keys);
}

// Call 'find_last_Index' with an array and an anonymous function checking for odd numbers, then display the result using 'echo'
echo find_last_Index([1, 2, 3, 4], function ($n) {
    return ($n % 2) === 1;
});

// Display a newline
echo "\n";

// Call 'find_last_Index' with an array and an anonymous function checking for even numbers, then display the result using 'echo'
echo find_last_Index([1, 2, 3, 4], function ($n) {
    return ($n % 2) === 0;
});

?>

Sample Output:

2
3

Flowchart:

PHP Code Editor:

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