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php文件上传表单的代码

Jun 06, 2016 pm 07:56 PM
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欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 参数说明 $type,$name,$size,$error,$tmp_name对应全局变量$_FILES中的相关变量,即: $_FILES['userfile']['type']:文件的MIME类型,需要浏览器提供该信息的支持,例如图片类型"image/gif". $_FILES

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  参数说明

  $type,$name,$size,$error,$tmp_name对应全局变量$_FILES中的相关变量,即:

  $_FILES['userfile']['type']:文件的MIME类型,需要浏览器提供该信息的支持,例如图片类型"image/gif".

  $_FILES['userfile']['name']:客户端文件的原名称。

  $_FILES['userfile']['size']:已上传文件的大小,单位为字节。

  $_FILES['userfile']['tmp_name']:文件被上传后在服务端储存的临时文件名。

  $_FILES['userfile']['error']:和该文件上传相关的错误代码,即

  值:0:没有错误发生,文件上传成功。

  值:1:上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。

  值:2:上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。

  值:3:文件只有部分被上传。

  值:4:没有文件被上传。

  $ext:上传文件扩展名

  $targetname:文件上传后的最终文件名

  $upload_dir:上传至哪个目录下,采用的是相对路径

  注释:

  第3行~第6行:设定图片文件上传的大小,以及文件的MIME类型以及扩展名,由于此代码为图片文件上传程序,所以两个数组中罗列了所有的图片类型,比如PNG,GIF,JEPG等。

  第17行~第24行:如果文件是空的,size等于0;如果图片文件的扩展名或者类型不符,则跳出。

  第26行:move_uploaded_file函数的功能是将upload_tmp_dir设定的服务端临时目录中的文件移至由$file_path指定的文件,注意如果目标文件已存在则覆盖目标文件

  如何上传多个文件?比如同时上传3个文件

  只需将

  

  改成

  

  

  

  对应的在调用此函数时,$_FILES['userfile']['name'][0],代表第一个文件的相关文件信息,依此类推,其他也一样。

  总结

  此函数是PHP文件上传中最简单的核心代码,图片上传只是其中一种,只需要修改或者扩充$FILE_MIMES和$FILE_EXTS数组的相关信息,即可实现其他类型的文件上传功能。在函数的外围,根据自己的需要编写相关的其他代码即可实现其他功能,比如和数据库的关联等。

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php文件上传表单的代码

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