PHP Array Exercises : Lower-case and upper-case, all elements in an array

PHP Array: Exercise-36 with Solution

Write a PHP script to lower-case and upper-case, all elements in an array.

Sample Solution:

PHP Code:

<?php
// Define an array with string values
$colors = array( "Red", "Green", "Black", "White"); 

// Display the original array using print_r
print_r($colors);

// Use array_map and strtolower to create an array with lowercase versions of each string
$lower_colors = array_map('strtolower', $colors);

// Display the array containing lowercase versions
print_r($lower_colors);

// Use array_map and strtoupper to create an array with uppercase versions of each string
$upper_colors = array_map('strtoupper', $colors);

// Display the array containing uppercase versions
print_r($upper_colors);

?>

Output:

Array                                                       
(                                                           
    [0] => Red                                              
    [1] => Green                                            
    [2] => Black                                            
    [3] => White                                            
)                                                           
Array                                                       
(                                                           
    [0] => red                                              
    [1] => green                                            
    [2] => black                                            
    [3] => white                                            
)                                                           
Array                                                       
(                                                           
    [0] => RED                                              
    [1] => GREEN                                            
    [2] => BLACK                                            
    [3] => WHITE                                            
)

Flowchart:

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP script to trim all the elements in an array using array_walk function.
Next: Write a PHP script to count the total number of times a specific value appears in an array.