How to delete specified pictures in php

How to delete a specified image in php: first read the URL address of the database avatar; then obtain the valid fields of the URL address; then set the file path; finally delete the image file through the unlink function.

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Use Scenario: New avatar replaces old avatar

Steps:

1. Read the URL address of the database avatar,

2. Get the valid fields of the URL address,

3. File file path setting

4. Delete image file

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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