Solution: The centos website server cannot upload files larger than 2 MB

Solution
[Root @ 2193 etc] # vi php. ini

; Maximum allowed size for uploaded files.
Upload_max_filesize = 10 M

; Maximum size of POST data that PHP will accept.
Post_max_size = 15 M

[Root @ 2193 etc] #/etc/rc. d/init. d/httpd restart
Stop httpd: [OK]
Start httpd: [OK]
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Parameters Involved in file upload in PHP
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
Whether to allow file upload over HTTP. ON is enabled by default.

Upload_tmp_dir
Upload_tmp_dir indicates the temporary directory where PHP files are uploaded. to upload files, make sure the server does not have the permission to close the temporary files and write the files to the folder. If not specified, PHP uses the system 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 in a form submission 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
The time for receiving data through POST, GET, and PUT is limited in seconds. If the running environment of the application is on the low-speed link, you need to add this value to adapt to the more time required to receive data.

Memory_limit
To avoid using a large amount of available memory by running scripts, PHP allows you to define the memory usage limit. Use the memory_limit variable to specify the maximum memory capacity variable memory_limit that can be used by a single script program. 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. The 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 prevent PHP from closing the script when the script is executing an important process.