PHP程序缓存之文件缓存处理方式

PHP程序缓存之文件缓存处理方式
在开发程序过程中，缓存的设置大大提升程序效率，减小数据库负载。
基本配置缓存和常规配置缓存

基本配置缓存在项目开发中类似这样子的格式：

文件：config.php

$CFG['database'] = 'mysql';
$CFG['pconnect'] = '0';
$CFG['db_host'] = 'localhost';
$CFG['db_name'] = 'appcom';
$CFG['db_user'] = 'root';
$CFG['db_pass'] = '123456';
$CFG['db_charset'] = 'utf8';

常规配置缓存类似这样的：例如文件x.php

return array (
'a'=>'','b'=>'','c'=>'','d'=>'',
'aa'=>array('x'=>'','y'=>,'z'=>''),
'bb'=>array('x'=>'','y'=>,'z'=>''),
'cc'=>array('x'=>'','y'=>,'z'=>''));

缓存配置程序代码：
基本配置的更新：

$tmp = file_get('config.inc.php');
foreach($setting as $k=>$v) {
            $tmp = preg_replace("/[$]CFG\['$k'\]\s*\=\s*[\"'].*?[\"']/is", "\$CFG['$k'] = '$v'", $tmp);

常规配置的更新:例如文件名为y.php

cache_write('y.php', $setting);
function cache_write($file, $string, $dir = '') {
    if(is_array($string)) $string = "<?php defined('IN_KELE') or exit('Access Denied'); return ".strip_nr(var_export($string, true))."; ?>";
    $file = $file;
    $strlen = file_put($file, $string);
    return $strlen;
}

function strip_nr($string, $js = false) {
    $string =  str_replace(array(chr(13), chr(10), "\n", "\r", "\t", '  '),array('', '', '', '', '', ''), $string);
    if($js) $string = str_replace("'", "\'", $string);
    return $string;
}
function file_put($filename, $data) {
$phpServer=strpos(strtoupper(PHP_OS), 'WIN') !== false ? true: false;
    dir_create(dirname($filename));    
    if(@$fp = fopen($filename, 'wb')) {
        flock($fp, LOCK_EX);
        $len = fwrite($fp, $data);
        flock($fp, LOCK_UN);
        fclose($fp);
        if($phpServer) @chmod($filename, $phpServer);
        return $len;
    } else {
        return false;
    }
}
function file_get($filename) {
    return @file_get_contents($filename);
}