What are potential server configurations or extensions, such as Suhosin, that could interfere with the $_POST variable in PHP?

Potential server configurations or extensions like Suhosin can interfere with the $_POST variable in PHP by limiting the size of POST data or filtering certain types of input. To solve this issue, you can adjust the configuration settings to allow larger POST data or disable any filters that may be affecting the $_POST variable.

ini_set('suhosin.post.max_vars', 10000); // Increase the maximum number of POST variables allowed
ini_set('suhosin.post.max_value_length', 1000000); // Increase the maximum POST data size allowed