<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\Util;
/**
* @author Issei Murasawa <issei.m7@gmail.com>
* @author Bernhard Schussek <bschussek@gmail.com>
class StringUtil
{
* This class should not be instantiated.
private function __construct()
}
* Returns the trimmed data.
* @param string $string
* @return string
public static function trim($string)
if (null !== $result = @preg_replace('/^[\pZ\p{Cc}]+|[\pZ\p{Cc}]+$/u', '', $string)) {
return $result;
return trim($string);
* Converts a fully-qualified class name to a block prefix.
* @param string $fqcn The fully-qualified class name
* @return string|null The block prefix or null if not a valid FQCN
public static function fqcnToBlockPrefix($fqcn)
// Non-greedy ("+?") to match "type" suffix, if present
if (preg_match('~([^\\\\]+?)(type)?$~i', $fqcn, $matches)) {
return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), $matches[1]));