PhpFrontend.php

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<?php
namespace TYPO3\CMS\Core\Cache\Frontend;

class PhpFrontend extends \TYPO3\CMS\Core\Cache\Frontend\StringFrontend {

    public function __construct($identifier, \TYPO3\CMS\Core\Cache\Backend\PhpCapableBackendInterface $backend) {
        parent::__construct($identifier, $backend);
    }

    public function set($entryIdentifier, $sourceCode, array $tags = array(), $lifetime = NULL) {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1264023823);
        }
        if (!is_string($sourceCode)) {
            throw new \TYPO3\CMS\Core\Cache\Exception\InvalidDataException('The given source code is not a valid string.', 1264023824);
        }
        foreach ($tags as $tag) {
            if (!$this->isValidTag($tag)) {
                throw new \InvalidArgumentException('"' . $tag . '" is not a valid tag for a cache entry.', 1264023825);
            }
        }
        $sourceCode = '<?php' . chr(10) . $sourceCode . chr(10) . '#';
        $this->backend->set($entryIdentifier, $sourceCode, $tags, $lifetime);
    }

    public function requireOnce($entryIdentifier) {
        return $this->backend->requireOnce($entryIdentifier);
    }

}