w3resource
php Programming Exercies

PHP Array Exercises : Get an array of all elements which have the keys that are present in another array

PHP Array: Exercise-49 with Solution

Write a PHP script to get an array containing all the entries of an array which have the keys that are present in another array.

Sample Solution:

PHP Code:

<?php
$first_array = array('c1' => 'Red', 'c2' => 'Green', 'c3' => 'White', 'c4' => 'Black'); 
$second_array = array('c2', 'c4'); 
print_r(array_intersect_key($first_array, array_flip($second_array)));
?>

Sample Output:

Array                                                       
(                                                           
    [c2] => Green                                           
    [c4] => Black                                           
) 

Flowchart:

Flowchart: PHP - Get an array of all elements which have the keys that are present in another array

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP function to set union of two arrays.
Next: Write a PHP script to get the last value of an array without affecting the pointer.

What is the difficulty level of this exercise?



New Content: Composer: Dependency manager for PHP, R Programming