<?php
//判断上传文件是否满足需求
if (!$_FILES['Filedata']) {
    die ( 'Image data not detected!' );
}
if ($_FILES['Filedata']['error'] > 0) {
    switch ($_FILES ['Filedata'] ['error']) {
        case 1 :
            $error_log = 'The file is bigger than this PHP installation allows';
            break;
        case 2 :
            $error_log = 'The file is bigger than this form allows';
            break;
        case 3 :
            $error_log = 'Only part of the file was uploaded';
            break;
        case 4 :
            $error_log = 'No file was uploaded';
            break;
        default :
            break;
    }
    die ( 'upload error:' . $error_log );
} else {
    $img_data = $_FILES['Filedata']['tmp_name'];
    $size = getimagesize($img_data);
    $file_type = $size['mime'];
    if (!in_array($file_type, array('image/jpg', 'image/jpeg', 'image/pjpeg', 'image/png', 'image/gif'))) {
        $error_log = 'only allow jpg,png,gif';
        die ( 'upload error:' . $error_log );
    }
    switch($file_type) {
        case 'image/jpg' :
        case 'image/jpeg' :
        case 'image/pjpeg' :
            $extension = 'jpg';
            break;
        case 'image/png' :
            $extension = 'png';
            break;
        case 'image/gif' :
            $extension = 'gif';
            break;
    }
}
if (!is_file($img_data)) {
    die ( 'Image upload error!' );
}
//图片保存路径,默认保存在该代码所在目录(可根据实际需求修改保存路径)
$save_path = dirname( __FILE__ ).'/public/images/upload/head_image';
$uinqid = uniqid();
$filename = $save_path . '/' . $uinqid . '.' . $extension;
$result = move_uploaded_file( $img_data, $filename );
if ( ! $result || ! is_file( $filename ) ) {
    die ( 'Image upload error!' );
}
echo 'Image data save successed,file:' . $filename;

require('library/Db.class.php');//连接数据库
session_start();//开启session
$user_id = $_SESSION['user']['id'];//获取登录用户id
$db      = new Db();
$head    = $uinqid . '.' . $extension;//组装路径
$sql     = "UPDATE mr_user SET avatar = :head WHERE id = :user_id";
$res     = $db->query($sql,array("user_id"=>$user_id,"head"=>$head));//更改头像
$_SESSION['user']['avatar'] = $head;//更改头像session信息
exit ();
