深入PHP数据缓存的使用说明-木庄网络博客

本文整理自网络，侵删。

代码如下:

<?php
// http://1000zx.cn/article/23093.htm
function set_cache($name, $value) {
    // 设置相对或者绝对目录，末尾不要加 "/"
    $cache_dir = "./cache";
    // 设置扩展名
    $cache_extension = ".php";

    $cache_str_begin = "<?php\n//Cache Created at: " . date ( "Y-m-d H:i:s" ) . "\n";
    if (! is_array ( $value )) {
        $cache_str_middle = "\$$name = \"$value\";";
    } else {
        $cache_str_middle = "\$$name = " . arrayeval ( $value ) . ";";
    }
    $cache_str_end = "\n?>";

    $cache_str = $cache_str_begin . $cache_str_middle . $cache_str_end;

    // 缓存文件路径
    $cache_file = "$cache_dir/$name$cache_extension";
    if ($fp = @fopen ( $cache_file, "wb" )) {
        fwrite ( $fp, $cache_str );
        fclose ( $fp );
        return true;
    } else {
        echo $cache_file;
        exit ( "Can not write to cache files, please check cache directory " );
        return false;
    }
}

// 将array变成字符串, 来自discuz!
function arrayeval($array, $level = 0) {
    if (! is_array ( $array )) {
        return "\"$array\"";
    }

    $space = "";
    for($i = 0; $i <= $level; $i ++) {
        $space .= "\t";
    }
    $evaluate = "Array\n$space(\n";
    $comma = $space;
    if (is_array ( $array )) {
        foreach ( $array as $key => $val ) {
            $key = is_string ( $key ) ? "\"" . addcslashes ( $key, "\"\\" ) . "\"" : $key;
            $val = ! is_array ( $val ) && (! preg_match ( "/^\-?[1-9]\d*$/", $val ) || strlen ( $val ) > 12) ? "\"" . addcslashes ( $val, "\"\\" ) . "\"" : $val;
            if (is_array ( $val )) {
                $evaluate .= "$comma$key => " . arrayeval ( $val, $level + 1 );
            } else {
                $evaluate .= "$comma$key => $val";
            }
            $comma = ",\n$space";
        }
    }
    $evaluate .= "\n$space)";
    return $evaluate;
}

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深入PHP数据缓存的使用说明

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