Php file upload restriction modification method summary

This article mainly introduces the php file upload restriction modification method, which is very detailed and comprehensive. it is basically the most comprehensive method. I hope you will like it. PHP's default upload limit is 2 MB. to upload files that exceed this setting, you need to adjust some parameters such as PHP and apache. Next, we will briefly introduce some parameters involved in php file upload:

File_uploads: indicates whether to allow file upload over HTTP. the default value is ON.

Upload_tmp_dir: upload_tmp_dir indicates the temporary directory for storing files uploaded by PHP. to upload files, ensure that the server does not have the permission to close the temporary files and write the files to the folder, if this parameter is not specified, PHP uses the default value.

Upload_max_filesize: maximum file size that can be uploaded. the default value is 2 MB.

Post_max_size: Controls the maximum data size that PHP can receive when a form is submitted using the POST method. If you want to use the php file upload function, you need to change this value to a value greater than upload_max_filesize.

Max_input_time: seconds are used to limit the time when data is received through POST, GET, and PUT methods. If the application's running environment is on a low-speed link, you need to add this value to adapt to the more time required to receive data.

Memory_limit: to avoid a large amount of memory available for running scripts, PHP allows you to define the memory usage limit. The memory_limit variable is used to specify the maximum memory capacity variable memory_limit that a single script program can use. The value of memory_limit should be greater than the value of post_max_size.

Max_execution_time: max_execution_time sets the time for PHP to wait for the script to be executed before the script is forcibly terminated. this time is calculated in seconds. This variable is useful when the script enters an infinite loop state. However, when there is a legal activity that takes a long time to complete (such as uploading large files), this function will also cause operation failure. In this case, you must consider increasing the value of this variable to avoid PHP closing the script when the script is executing an important process.

For linux hosts, the php. conf file may exist under/etc/httpd/conf. d/access. conf/. This file may solve the file size restrictions of some systems.

The above is all the content of this article. I hope it will help you master php file uploading.