PHP file upload - configure php.ini file and predefined variable $_FILES

php file upload - configure the php.inn file and the predefined variable $_FILES

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1: Configure the php.ini file

• file_uploads: If the value is on, it means that the server supports uploading files; if it is off, it means that it does not support it. .

• upload_tem_dir: Temporary directory for uploading files. Before the file is successfully uploaded, the file is first stored in the temporary directory on the server. If you want to specify the location, you can set it here. Otherwise, just use the system default directory.

• upload_max_filesize: The maximum size of files allowed to be uploaded by the server, in MB. The system default is 2MB, and users can set it by themselves.

• max_execution_time: The maximum time that a command can be executed in PHP, in seconds;

• memory_limit: Allocated by a command in PHP There is no storage space, the unit is MB;

Instructions:

1. If you use the integrated Install the package to configure the PHP development environment. The configuration information described above has been configured by default!

2. If you want to upload very large files, you need to modify some parameters of php.ini, including upload_max_filesize, the maximum value of the files allowed to be uploaded by the server, and max_execution_time, which can be executed by one command. The maximum time and memory_limit memory space allocated by one instruction!

2: Predefined variable $_FLIES##$_FLIES variable stores information related to uploaded files. This information is useful for The upload function is very useful. This variable is a two-dimensional array. The description of the predefined variable $_FILES elements is as follows:

The following example creates an upload file field and outputs the uploaded file information through the $_FILES variable. The specific sample code is as follows;

  
  
 
 
请选择上传文件:
  
  
 
  
    $value){ //使用 foreach 循环输出上传文件信息的名称和值 echo $name,"=".$value."
"; } } ?>

The output result is:

In the next article, we will introduce the file upload function and multi-file upload. Please read the details. "PHP file upload-detailed explanation of the use of move_uploaded_file() function"

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