PHP Array Exercises : Remove duplicate values from an array which contains only integers or strings

Last update on December 20 2024 10:17:14 (UTC/GMT +8 hours)

Write a PHP program to remove duplicate values from an array which contains only strings or only integers.

Sample Solution:

PHP Code:

<?php
// Define an array of colors
$colors = array( 
    0 => 'Red', 
    1 => 'Green', 
    2 => 'White', 
    3 => 'Black', 
    4 => 'Red', 
); 

// Define an array of numbers
$numbers = array( 
    0 => 100, 
    1 => 200, 
    2 => 100, 
    3 => -10, 
    4 => -10, 
    5 => 0, 
);

// Use array_flip to swap keys and values, then use array_keys to extract unique values
$uniq_colors = array_keys(array_flip($colors)); 

// Use array_flip to swap keys and values, then use array_keys to extract unique values
$uniq_numbers = array_keys(array_flip($numbers)); 

// Display the array of unique colors
print_r($uniq_colors);

// Display the array of unique numbers
print_r($uniq_numbers);

?>

Output:

Array                                                       
(                                                           
    [0] => Red                                              
    [1] => Green                                            
    [2] => White                                            
    [3] => Black                                            
)                                                           
Array                                                       
(                                                           
    [0] => 100                                              
    [1] => 200                                              
    [2] => -10                                              
    [3] => 0                                                
)

Flowchart:

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP function to create a multidimensional unique array for any single key index.
Next: Write a PHP program to get a sorted array without preserving the keys.