PHP Array Exercises : Sort an array using case-insensitive natural ordering

Last update on May 30 2025 13:14:04 (UTC/GMT +8 hours)

24. Case-Insensitive Natural Order Sorting

Write a PHP script to sort an array using case-insensitive natural ordering.

Sample Solution:

PHP Code:

<?php
// Define an array of colors with non-sequential keys
$colors = array(
    "color1", "color20", "color3", "color2"
);

// Sort the array in natural order, case-insensitive
sort($colors, SORT_NATURAL | SORT_FLAG_CASE);

// Iterate through the sorted array and display each element
foreach ($colors as $key => $val) {
    echo "Colors[" . $key . "] = " . $val . "\n";
}

?>

Output:

Colors[0] = color1                                          
Colors[1] = color2                                          
Colors[2] = color3                                          
Colors[3] = color20

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to sort an array of mixed-case strings using natural order sorting in a case-insensitive manner.
Write a PHP function to apply natsort() with case insensitivity to sort an array and then output the sorted values.
Write a PHP program to compare case-insensitive natural sorting with standard sorting to highlight differences in ordering.
Write a PHP script to sort an array of filenames naturally while ignoring case sensitivity, then display them in a formatted list.

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