PHP 静态缓存

<?php

// echo dirname(__FILE__).'/cache';
// exit;
/**

• 静态缓存

*/
class Cacha {

private $_dir; // 目录
    
const EXT = '.txt'; // 后缀

public function __construct()
{
    $this->_dir = dirname(__FILE__).'/cache/';
    
}
public function catchData($key, $value = '', $catchTime = 0)
{
    $filename = $this->_dir.$key.self::EXT; // 拼装文件名

    if (!empty($value)) { // 写入缓存

        // 删除缓存
    if (is_null($value)) {

        return @unlink($filename);
    }
    // 获取文件目录
        $dir = dirname($filename);
        if (!is_dir($dir)) {
            mkdir($dir,0777);
        }
        $catchTime = sprintf('%011d', $catchTime);
        file_put_contents($filename, $catchTime.json_encode($value));
        return true;
    }

    if (!is_file($filename)) {
        return false;
    } 
        // 获取缓存失效时间
        $contents = file_get_contents($filename);
        $catchTime = (int)substr($contents, 0, 11);
        $value = substr($contents, 11);
        // echo $value;exit;

        // 缓存失效
        if ($catchTime != 0 && ($catchTime + filemtime($filename) < time())) {
            unlink($filename);
            return false;
        }
        return json_decode($value,true);
       
}

}
$data = [

'id' => 1,
'name' => 'lw',
'info' => [
    'sex' => '男',
    'age' => 18,

],

];
$test = new Cacha;
var_dump(($test->catchData('test')));