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PHP实现文件上传功能

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Release: 2016-06-06 20:12:15
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PHP实现一个文件上传的功能还是比较容易的,这里简单记录一下自己使用方法。 这里是一次接收多个文件上传的脚本upload.php,如下: ?php// 实现多个文件上传并保存的后端?//设置编码为UTF-8,以避免中文乱码header('Content-Type:text/html;charset=utf-8');

PHP实现一个文件上传的功能还是比较容易的,这里简单记录一下自己使用方法。
这里是一次接收多个文件上传的脚本upload.php,如下:

<?php // 实现多个文件上传并保存的后端
?
//设置编码为UTF-8,以避免中文乱码
header('Content-Type:text/html;charset=utf-8');
?
//获取多个文件的信息,注意:这里的键名不包含[]
$fileArray = $_FILES['upload_file'];
?
$upload_dir = 'img/'; //保存上传文件的目录
?
foreach ( $fileArray['error'] as $key => $error ) {
if ( $error == UPLOAD_ERR_OK ) { //PHP常量UPLOAD_ERR_OK值为0,表示文件上传成功
$temp_name = $fileArray['tmp_name'][$key];
$file_name = $fileArray['name'][$key];
move_uploaded_file($temp_name, $upload_dir.$file_name);
echo '上传[文件'.$key.':'.$file_name.']成功!';
}else {
echo '上传[文件'.$key.':'.$file_name.']失败!';
}
}
?>
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关于上传文件的大小限制,对于我目前的nginx + php-fpm,有nginx和php的两层限制。
nignx的限制,目前默认是1MB的请求body,可以在配置文件/etc/nginx/nginx.conf中来调整:

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
?
    client_max_body_size 10M;   #设置最大的body size
    ...
}
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如果超过client_max_body_size的限制,nginx会返回413响应码表示“Request Entity Too Large ”。

PHP对post请求内容的大小限制:
在/etc/php.ini文件中,有如下内容:

?
; Maximum amount of time each script may spend parsing request data. It's a good
; idea to limit this time on productions servers in order to eliminate unexpectedly
; long running scripts.
; http://www.php.net/manual/en/info.configuration.php#ini.max-input-time
max_input_time = 60
?
; Maximum size of POST data that PHP will accept.
; http://www.php.net/manual/en/ini.core.php#ini.post-max-size
post_max_size = 10M
?
; Whether to allow HTTP file uploads.
; http://www.php.net/manual/en/ini.core.php#ini.file-uploads
file_uploads = On
?
; Maximum allowed size for uploaded files.
; http://www.php.net/manual/en/ini.core.php#ini.upload-max-filesize
upload_max_filesize = 10M
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参考资料:

http://www.365mini.com/page/php-upload-file.htm

http://www.php.net/manual/zh/features.file-upload.php

http://forum.nginx.org/read.php?2,139769,139769#msg-139769

Original article: PHP实现文件上传功能

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