PHP Array Exercises : Filter a multi-dimensional array and get those items that will match with the specified value

Last update on May 30 2025 13:13:52 (UTC/GMT +8 hours)

52. Filter a Multi-Dimensional Array by Value

Write a PHP function to filter a multi-dimensional array. The function will return those items that will match with the specified value.

Sample Solution:

PHP Code:

<?php
    // Function to filter a multi-dimensional array based on a specific value in a specified index
    function array_filter_by_value($my_array, $index, $value)
    { 
        // Check if the input is a non-empty array
        if(is_array($my_array) && count($my_array) > 0)  
        { 
            // Loop through the keys of the input array
            foreach(array_keys($my_array) as $key){ 
                // Extract the value at the specified index for the current key
                $temp[$key] = $my_array[$key][$index]; 
                 
                // Check if the extracted value matches the desired value
                if ($temp[$key] == $value){ 
                    // If so, add the corresponding array to the new array
                    $new_array[$key] = $my_array[$key]; 
                } 
            } 
        } 
        // Return the filtered array
        return $new_array; 
    } 

    // Example usage
    $colors = array( 
        0 => array('key1' => 'Red', 'key2' => 'Green', 'key3' => 'Black'), 
        1 => array('key1' => 'Yellow', 'key2' => 'White', 'key3' => 'Pink') 
    ); 
    // Filter the array based on the value 'White' in the 'key2' index
    $results = array_filter_by_value($colors, 'key2', 'White');     
    // Print the filtered results
    print_r($results);      
?>

Output:

Array                                                       
(                                                           
    [1] => Array                                            
        (                                                   
            [key1] => Yellow                                
            [key2] => White                                 
            [key3] => Pink                                  
        )                                                   
                                                            
)

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP function to search through a multidimensional array and return all subarrays where a specified key equals a given value.
Write a PHP script to filter a multidimensional array based on a specific value and then output the filtered result.
Write a PHP program to use array_filter recursively on a multidimensional array to match a target value.
Write a PHP script to implement a function that extracts subarrays from a multidimensional array when a specified key has a designated value.

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