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

PHP: Exercise-81 with Solution

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

Sample Solution:

PHP Code:

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

    // Use 'array_pop' to retrieve and return the last element from the filtered array
    return array_pop($filteredItems);
}

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

// Display a newline
echo "\n";

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

?>

Explanation:

• Define find_Last Function:
• The function find_Last accepts:
• $items: an array of items to search through.
• $func: a custom function used to filter the items.
• Filter Array Using Custom Function:
• array_filter($items, $func): Filters $items according to $func, resulting in an array of items that meet the function’s condition (e.g., odd or even numbers).
• Return the Last Matching Item:
• array_pop($filteredItems): Retrieves and returns the last element in filteredItems, which is the last item in $items that met the condition specified by $func.
• Function Calls and Output:
• find_Last([1, 2, 3, 4], function ($n) { return ($n % 2) === 1; }):
• Filters for odd numbers, returns 3, the last odd number.
• find_Last([1, 2, 3, 4], function ($n) { return ($n % 2) === 0; }):
• Filters for even numbers, returns 4, the last even number.
• Purpose:
• The function find_Last finds and returns the last element in an array that meets a specified condition, offering a flexible way to retrieve elements based on custom criteria.

Output:

3
4

Flowchart:

PHP Code Editor:

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