How to Convert Array Values to Lowercase in PHP

Converting Array Values to Lowercase in PHP

PHP programmers often encounter the need to convert array values to lowercase for various tasks such as data manipulation or comparison. To achieve this, PHP offers several effective techniques.

Method 1: array_map()

The most straightforward approach involves using array_map() in conjunction with the strtolower() function. This method applies strtolower() to each element in the array, effectively converting them all to lowercase.

<code class="php">$yourArray = array_map('strtolower', $yourArray);</code>

Method 2: Custom Recursive Function

For nested arrays, a recursive function can be employed to convert values at all levels to lowercase.

<code class="php">$yourArray = array_map('nestedLowercase', $yourArray);

function nestedLowercase($value) {
    if (is_array($value)) {
        return array_map('nestedLowercase', $value);
    }
    return strtolower($value);
}</code>

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