PHP built-in functions
$ _ SERVER ['script _ name'] returns the relative path of/mantis/test. php.
_ FILE _ returns the absolute path of the object
$ _ SERVER ['HTTP _ X_FORWARDED_PROTO ']
$ _ SERVER ['https']
$ _ SERVER ['server _ port']
$ _ SERVER ['request _ url']
$ GLOBALS
Explode
Implode
$ _ SERVER ['server _ name']
$ _ SERVER ['HTTP _ host']
$ _ SERVER ['server _ ADDR ']
Trim
Basename
Dirname
Krsort
Set_time_limit ()
Time ()
Is_string ()
Is_bool
Is_Inteter
Is_float
Strtotime
File_exists
Fopen ()
Feof ()
Fgets ()
Trim ()
Strlen ()
Str_replace
Isset
Strpo
$ _ SERVER ['server _ SOFEWARE ']
Realpath
DIRECTORY_SEPARATOR
PATH_SEPARATOR
Set_include_path
Get_include_path
Count ()
Substr ()
$ _ SERVER ['local _ ADDR ']
$ _ SERVER ['remote _ ADDR ']
Array_pad
Memory_get_usage ()
Spl_atuoload_register
Strtolower ()
Preg_replace
Preg_match
Ceil ()
Floor ()
Round ()