PHP system functions that all programmers should know

As a veteran-level PHP programmer, knowing the following PHP system-level functions is not enough! It should be useful when getting system information and debugging programs!

PHP system class function

assert function: Check whether the assertion statement is wrong extension_loaded function: Check whether the PHP extension is loaded get_cfg_var function: Get the value of the PHP configuration option get_current_user function: Get the name of the owner of the current PHP script get_defined_constants function: Returns an array containing PHP predefined constant information get_extension_funcs function: Returns an array containing the names of all functions in the specified module get_include_path function: Returns the currently configured file inclusion path information get_included_files Function: Returns an array containing information about the file get_loaded_extensions function: Returns an array containing information about all loaded modules get_magic_quotes_gpc function: Gets the status information of magic_quotes_gpc get_magic_quotes_runtime function: Gets the status information of magic_quotes_ runtime get_required_files function: Returns an array containing information about the file getenv function: Get the value of the PHP environment variable

PHP system class function

getlastmod function: Get the last modification time of the current PHP page file getmygid function: Get the current PHP script The GID number of the page owner getmyinode function: Get the INODE number of the current PHP script page getmypid function: Get the PID of PHP getmyuid function: Get the UID number of the PHP script page owner getopt function: Get the settings from the command line parameter list getrusage function: Get Current resource syntax ini_get_all function: Get all configuration options ini_get function: Get the value of the configuration option memory_get_usage function: Return the memory space occupied by the PHP script php_ini_scanned_files function: Return the configuration file list in the configuration file directory php_logo_guid function: Get the GUID of the LOGO image php_sapi_name Function: Get the interface type between PHP and the Web server php_uname function: Get the operating system information on which the PHP script is running phpcredits function: Print the credits list phpinfo function: Output PHP information phpversion function: Get the PHP version zend_logo_guid function: Get the ZEND LOGO image GUID zend_version function: Get the version of the ZEND engine

PHP configuration class function

assert_options function: Set or get different declaration tags ini_alter function: Set PHP configuration options Value ini_restore function: restore the value of the configuration option ini_set function: set the value of the PHP configuration option putenv function: set the environment variable restore_include_path function: restore the file include path configuration information set_include_path function: set the file include path configuration option set_magic_quotes_runtime function: set the magic_quotes run time set_time_limit Function: Set the maximum execution time

Other functions

dl function: Load the PHP extension module main function: Just a nominal main() function version_compare function: compare PHP two version values

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