Php Configuration File (php.ini)

The 'php.ini' file is the default configuration file for running applications that require PHP. It is used to control variables such as script execution time, upload sizes etc. Some common setting variables with description are as follows:

Category	Variable	Default Value	Description
Register Global	register_globals	Off	Whether or not to register the EGPCS (Environment, GET, POST, Cookie, Server) variables as global variables. For more detail read here
File Upload	file_uploads	On	Whether to allow HTTP file uploads.
	upload_tmp_dir	NULL	Temporary directory for HTTP uploaded files (will use system default if not specified).
	upload_max_filesize	2M	Maximum allowed size for uploaded files. PHP allows shortcuts for bit values, including K (kilo), M (mega) sand G (giga).
	max_file_uploads	20	The maximum number of files allowed to be uploaded simultaneously.
Post	post_max_size	8M	Sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than 'upload_max_filesize'. Default value is 8Mb.
Session	session.gc_maxlifetime	1440	Default sessin time in php. The default value is on seconds (1440 sec = 24 min)
	session.auto_start	0	Initialize session on request startup.(Turning on session support automatically at site level)
Resource Limit	max_execution_time	30	Maximum execution time of each script, in seconds.
Error Reporting	error_reporting	E_ALL	Display types of error. E_ALL display all types of error.

Full directives can be found at here (php official website).