How to delete pictures in php

php method to delete pictures

Usage scenario: new avatar replaces old one

Steps:

1. Read the URL address of the database avatar,

2. Get the valid fields of the URL address,

3. Set the file path

4. Delete image files

Thinkphp code is as follows:

public function delPic(){
    //获取前端传参 用户的uid
    $uid = I('uid');
    if(!$uid) $this->error('uid未获取');
    //获取url
    $url = M('Member')->where(array('uid'=>$uid))->getField('avatar');//$url = 'http://www.test.com/up/avatar/59b25bcfcaac6.jpg'
if(!$url) $this->error('数据库获取头像网址失败!');
    //获取$url有效字段（去掉网址）
    $str = substr($url, 20);//$str = 'up/avatar/59b25bcfcaac6.jpg'
    //file文件路径
    $filename = './'.$str;
    //删除
    if(file_exists($filename)){
        $info ='原头像删除成功';
        unlink($filename);
    }else{
        $info ='原头像没找到:'.$filename;
    }
    echo $info;
}

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