PHP Array Exercises : Remove a specified duplicate entry from an array

Last update on May 30 2025 13:13:55 (UTC/GMT +8 hours)

44. Remove Specified Duplicate Entry from Array

Write a PHP a function to remove a specified duplicate entry from an array.

Sample Solution:

PHP Code:

<?php
// Define a function to remove a specified number of occurrences of a value from an array
function array_uniq($my_array, $value) 
{ 
    $count = 0; 
    
    // Iterate through the array
    foreach($my_array as $array_key => $array_value) 
    { 
        // If more than 0 occurrences and the current value matches the specified value, unset it
        if (($count > 0) && ($array_value == $value)) 
        { 
            unset($my_array[$array_key]); 
        } 
        
        // If the current value matches the specified value, increment the count
        if ($array_value == $value) $count++; 
    } 
    
    // Remove any null or empty elements from the array
    return array_filter($my_array); 
} 

// Example usage: an array of numbers
$numbers = array(4, 5, 6, 7, 4, 7, 8);

// Call the function with the array and a value to remove
print_r(array_uniq($numbers, 7));

?>

Output:

Array                                                       
(                                                           
    [0] => 4                                                
    [1] => 5                                                
    [2] => 6                                                
    [3] => 7                                                
    [4] => 4                                                
    [6] => 8                                                
)     

Flowchart:

For more Practice: Solve these Related Problems:

• Write a PHP function to remove the first occurrence of a specified duplicate value from an array and return the cleaned array.
• Write a PHP script to identify and remove a given duplicate entry from an array, ensuring only one instance is removed.
• Write a PHP program to filter out a specific duplicate value from an array using array_filter() and reindex the array.
• Write a PHP script to remove all but one occurrence of a specified element from an array and then display the final result.

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