$_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()