php-vn-lib/lib/util.php

<?php

/**
 * Retrieves an element from an associative array or %NULL if it is not
 * defined.
 */
function nullif ($map, $key)
{
	return isset($map[$key]) ? $map[$key] : NULL;
}

/**
 * Checks if passed $path is inside directory $dir.
 */
function checkFilePath($file, $path)
{
	$checkPath = stream_resolve_include_path($path).'/';
	$filePath = stream_resolve_include_path($checkPath.$file);

	$len = strlen($checkPath);
	return substr($filePath, 0, strlen($checkPath)) === $checkPath;
}

/**
 * Checks if passed token is hyphenized.
 */
function isHyphen($token) {
	return preg_match('/^[\w\-]+$/', $token);
}

/**
 * Transforms an hyphen string to camelcase.
 */
function hyphenToCamelCase($string, $upperFirst = FALSE) {
	$replaceFunc = function($matches) {
		return strtoupper($matches[0][1]);
	};

	$result = preg_replace_callback('/-[a-z]/', $replaceFunc, $string);
	
	if ($upperFirst)
		$result = strtoupper($result[0]) .  substr($result, 1);
		
	return $result;
}