PHP常用内置函数
$_SERVER['SCRIPT_NAME'] 返回/mantis/test.php 相对路径
__FILE__返回文件的绝对路径
$_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()
