Converting to PascalCase, camelCase, kebab-case, snake_case, and SCREAMING_SNAKE_CASE

gistfile1.txt

<?php
/**
 * @license CC0
 * @copyright 2025 Anthon Pang
 * @author Anthon Pang <[email protected]>
 */

/**
 * Case Converter
 */
class CaseConverter
{
    /**
     * Translate "case"
     *
     * @param string $targetCase one of 'pascal', 'camel', 'kebab', 'snake', 'screaming snake'
     * @param string $symbol
     *
     * @return string
     */
    public function translate($targetCase, $symbol)
    {
        if (strpos($symbol, '-') !== false || strpos($symbol, '_') !== false) {
            // kebab or snake 
            $words = preg_split('~[_-]+~', $symbol);
        } elseif (! preg_match('~[a-z]~', $symbol)) {
            // screaming
            $words = [$symbol];
        } else {
            // pascal or camel
            preg_match_all('~(^[a-z][^A-Z]*|[A-Z]+[^A-Z]*)~', $symbol, $matches);
            $words = $matches[0];
        }

        switch ($targetCase) {
            case 'pascal':
                return implode('', array_map('ucfirst', $words));
            case 'camel':
                return lcfirst(implode('', $words));
            case 'kebab':
                return implode('-', array_map('strtolower', $words));
            case 'snake':
                return implode('_', array_map('strtolower', $words));
            default:
                return implode('_', array_map('strtoupper', $words));
        }
    }
}

Don't send pull requests. I was bored one night and just coded this for fun.

There are unhandled cases, e.g., where the symbol is _.