ThinkPHP/Library/Vendor/Smarty/sysplugins/smarty_internal_write_file.php

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<?php
/**
 * Smarty write file plugin
 *
 * @package Smarty
 * @subpackage PluginsInternal
 * @author Monte Ohrt
 */

/**
 * Smarty Internal Write File Class
 *
 * @package Smarty
 * @subpackage PluginsInternal
 */
class Smarty_Internal_Write_File {

    /**
     * Writes file in a safe way to disk
     *
     * @param string $_filepath complete filepath
     * @param string $_contents file content
     * @param Smarty $smarty    smarty instance
     * @return boolean true
     */
    public static function writeFile($_filepath, $_contents, Smarty $smarty)
    {
        $_error_reporting = error_reporting();
        error_reporting($_error_reporting & ~E_NOTICE & ~E_WARNING);
        if ($smarty->_file_perms !== null) {
            $old_umask = umask(0);
        }

        $_dirpath = dirname($_filepath);
        // if subdirs, create dir structure
        if ($_dirpath !== '.' && !file_exists($_dirpath)) {
            mkdir($_dirpath, $smarty->_dir_perms === null ? 0777 : $smarty->_dir_perms, true);
        }

        // write to tmp file, then move to overt file lock race condition
        $_tmp_file = $_dirpath . DS . uniqid('wrt');
        if (!file_put_contents($_tmp_file, $_contents)) {
            error_reporting($_error_reporting);
            throw new SmartyException("unable to write file {$_tmp_file}");
            return false;
        }

        // remove original file
        @unlink($_filepath);

        // rename tmp file
        $success = rename($_tmp_file, $_filepath);
        if (!$success) {
            error_reporting($_error_reporting);
            throw new SmartyException("unable to write file {$_filepath}");
            return false;
        }

        if ($smarty->_file_perms !== null) {
            // set file permissions