How to delete files by time in PHP?

#How to delete files by time in PHP?

First use the function "opendir()" to read all files in the folder; then use the function "is_dir()" to filter out the folder; then use the function "filemtime()" to get the file creation time; finally delete it according to the creation time.

Code example

<?php
/*
 * 删除文件夹下$n分钟前创建的文件
 * @param $dir 要处理的目录，物理路径，结尾不加\
 * @param $n 过期时间，单位为分钟
 * @return void
 */
function del_file_by_ctime($dir,$n){
    if(is_dir($dir)){
        if($dh=opendir($dir)){
            while (false !== ($file = readdir($dh))){
                if($file!="." && $file!=".."){
                    $fullpath=$dir."/".$file;
                    if(!is_dir($fullpath)){ 
                        $filedate=filemtime($fullpath);
                        $minutes=round((time()-$filedate)/60);
                        if($minutes>$n) unlink($fullpath); //删除文件
                    }
                }
            }
        }
        closedir($dh);
    }
}


//下面是调用的代码
//删除1天前的文件
$dir = realpath(&#39;./Upload/export&#39;);
del_file_by_ctime($dir, 24*60);
?>

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