PHP Array Exercises : Filter array elements with certain key-names

Last update on May 30 2025 13:14:39 (UTC/GMT +8 hours)

51. Filter Out Elements with Certain Key-Names

Write a PHP program to filter out some array elements with certain key-names.

Sample Solution:

PHP Code:

<?php
// Original associative array
$first_array = array('c1' => 'Red', 'c2' => 'Green', 'c3' => 'White', 'c4' => 'Black'); 

// Array containing keys to be excluded from the original array
$second_array = array('c2', 'c4');

// Use array_flip to swap keys and values, then array_diff_key to get the difference in keys
$result = array_diff_key($first_array, array_flip($second_array));

// Print the resulting array
print_r($result);

?>

Output:

Array                                                       
(                                                           
    [c1] => Red                                             
    [c3] => White                                           
)

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to remove elements from an associative array if their keys are found in a specified exclusion list.
Write a PHP function that accepts an associative array and an array of keys to omit, returning the filtered array.
Write a PHP program to iterate over an associative array and display only key-value pairs whose keys do not match a given pattern.
Write a PHP script to use array_diff_key() to filter out array elements based on an exclusion key list.

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PHP Code Editor:

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