Convert snake case to camel case

snake2camel.php

<?php

/**
 * Convert a snake-cased string to a camel-cased one.
 *
 * @param   string  $snakeString  The original snake-cased string.
 * @param   bool    $first        Whether the first letter should be capitalized
 *                                (useful for classnames vs. properties).
 * @return  string                The converted string.
 */
function snake2Camel($snakeString, $first = false)
{
    $camel = implode('', array_map(function($piece) {
        return empty($piece) ? '_' : ucfirst(strtolower($piece));
    }, explode('_', $snakeString)));

    return $first ? $camel : lcfirst($camel);
}

function snake2camelCaseRecursive($data)
	{
		$list=[];
		foreach($data as $key=>$value)
		{
			if(is_array($value))
			{
				$list[snake2camel($key)] = snake2camelCaseRecursive($value);
			}
			else
			{
				$list[snake2camel($key)] = $value;
			}
		}

		return $list;
	}

function snake2Camel($snakeString, $first = false)
	{
		if(is_numeric($snakeString))
		{
			return $snakeString;
		}

		$camel = implode(
			'',
			array_map(
				function ($piece) {
					return empty($piece) ? '_' : ucfirst(strtolower($piece));
				},
				explode('_', $snakeString)
			)
		);

		return $first ? $camel : lcfirst($camel);
	}