Here are functions for getting and setting PHP configuration options at runtime, as well as logging and other functions that are useful during debugging:
int debugger_off(void)Disable the internal PHP debugger
int debugger_on(string ip_address)Enable the internal PHP debugger
int error_log(string message, int message_type[, string destination] [, string extra_headers])Send an error message somewhere
int error_reporting([int level])Set/get the current error reporting level
string get_cfg_var(string option_name)Get the value of a PHP configuration option
int get_magic_quotes_gpc(void)Get the current active configuration setting of
magic_quotes_gpcint get_magic_quotes_runtime(void)Get the current active configuration setting of
magic_quotes_runtimevoid phpinfo(void)Output a page of useful information about PHP and the current request
string phpversion(void)Return the current PHP version
int set_magic_quotes_runtime(int new_setting)Set the current active configuration setting of
magic_quotes_runtimeand return the previous valuevoid set_time_limit(int seconds)Set the execution time limit for the current script
int short_tags(int state)Turn the short tags option on or off and return the previous state
The syslog functions provide an interface to the Unix syslog facility. On NT, these functions have been abstracted to use NT’s Event Log mechanism instead:
int closelog(void)Close the connection to the system logger
void define_syslog_variables(void)Initialize all syslog-related variables
int openlog(string ident, int option, intfacility)Open a connection to the system logger
int syslog(int priority, string message)Generate a system log message