PHP large file upload problem analysis

Introduce the configuration method of uploading large files in PHP, explain some PHP upload parameters, and learn how to upload large files in PHP. Friends in need can refer to it.

Parameters required for php file upload: Several parameter adjustments: 0: The temporary directory where files are stored when uploading files. Must be a directory writable by the PHP process owner user. If not specified PHP uses system defaults The upload_tmp_dir in the php.ini file is used to describe the temporary directory where files uploaded by PHP are placed. To upload files, you need to ensure that the server has not closed temporary files and has write permissions on the folder

1：max_execution_time The variable max_execution_time sets the time, measured in seconds, that PHP waits for the script to complete before forcibly terminating the script. This variable is useful when the script enters an infinite loop. However, this feature can also cause the operation to fail when there is a legitimate activity that takes a long time to complete (such as uploading a large file). In this case, you need to consider increasing the value of this variable to prevent PHP from shutting down the script while it is performing some important process. max_execution_time = 90

2: file_uploads = On

3: upload_max_filesize = 2M

4: post_max_size

A variable related to form submission is post_max_size, which will control the maximum amount of data that PHP can receive in a form submission using the POST method. It doesn't seem big. You may need to change the default 8 MB to a larger size. Instead, it should be appropriately reduced to a more realistic value. But if you want to use the PHP file upload function, you need to change this value to be larger than upload_max_filesize. post_max_size = 8M

5: max_input_time This variable can limit the time in seconds for receiving data through POST, GET, and PUT methods. If your application is running on a slow link, you may need to increase this value to accommodate the additional time required to receive data. max_input_time = 90

6：memory_limit memory_limit = 8M

To avoid running scripts from using a large amount of system available memory, PHP allows you to define memory usage limits. Use the memory_limit variable to specify the maximum memory capacity that a single script can use

The value of the variable memory_limit should be appropriately larger than the value of post_max_size

Implement PHP large file upload, a simple configuration example:

1: Open php.ini, first find

file_uploads = on ; Switch whether to allow file uploads via HTTP. The default is ON. upload_tmp_dir; Upload files to the server where temporary files are stored. If not specified, the system default temporary folder will be used. upload_max_filesize = 8m; as expected, that is, the maximum size of the uploaded file allowed. Default is 2M post_max_size = 8m; refers to the maximum value that can be received through form POST to PHP, including all values ​​in the form. The default is 8M

Generally, after setting the above four parameters, uploading files

But if you want to upload a large file >8M, it will definitely work if you only set the above four items. Unless your network really has a 100M/S upload speed, you still have to care about the following parameters.

max_execution_time = 600; Maximum time value (seconds) for each PHP page to run, default 30 seconds max_input_time = 600; The maximum time required for each PHP page to receive data, default 60 seconds memory_limit = 8m; The maximum memory consumed by each PHP page, default 8M

After modifying the above parameters, you can upload large files under normal circumstances allowed by the network.