what are these settings?

[stef534]

PHP Code:

max_execution_time = 6     ; Maximum execution time of each script, in seconds
max_input_time = 6    ; Maximum amount of time each script may spend parsing request data
memory_limit = 512M 


What happens when i change them, i see these settings in 3-4 files(php.ini in apache/bin, and other folders) If i change them in that way , will it change something?