The most common ini functions for PHP configuration files

Php configuration functions are several ini _ * functions, mainly for configuration file operations. In fact, there are four functions: ini_get, ini_set, ini_get_all, and ini_restore. The most useful ones are ini_set and ini_get. * Ini_get (): The php configuration function used to obtain the configuration file is a few ini _ * functions, mainly for configuration file operations. In fact, there are four functions: ini_get, ini_set, ini_get_all, and ini_restore. The most useful ones are ini_set and ini_get.

* Ini_get (): gets the option value of the configuration file.

This function is often used by many people to obtain the value of an option in the configuration file. if it is true, 1 is returned. if it is false, 0 is returned, and the string is returned.

For example, in the manual:

<? Php /* Our php. ini contains the following settings: Display_errors = On Register_globals = Off Post_max_size = 8 M */ Echo 'display _ errors = '. ini_get ('display _ errors'). "\ n"; // check whether an error is enabled. Echo 'register _ globals = '. ini_get ('register _ globals'). "\ n"; // whether the global variable is enabled Echo 'post _ max_size = '. ini_get ('post _ max_size'). "\ n"; // maximum file size that can be submitted Echo 'post _ max_size + 1 = '. (ini_get ('post _ max_size') + 1). "\ n "; ?>

Output:

Display_errors = 1 Register_globals = 0 Post_max_size = 8 M Post_max_size + 1 = 9

This function is mainly used to obtain the configuration file and facilitate many operations. For example, if you want to filter strings, but do not know whether magic_quotes_gpc is enabled, you can write a function like this:

/* String filter function */ Function stringFilter ($ str) { If (ini_get ('Magic _ quotes_gpc )'){ Return $ str; } Else { Return addslashes ($ str ); } }

Of course, if you cannot know whether your global variables are enabled, you can also customize the following functions:

/* Variable detection function */ Function getGetVar ($ var) { If (ini_set ('register _ gobals ')){ Return $ var; } Else { Return $ _ GET ['var']; } }

Of course, you can do a lot of things for yourself.