parse_str()
isset()
define()
http_build_query()
strlen()
str_word_count()
strrev()
strpos()
str_replace()
session_start()
session_abort()
session_reset()
session_destroy()
$_SESSION[]
is_float()
is_numeric()
pi()
min()
max()
abs()
sqrt()
round()
rand()
array()
[]
count()
in_array()
sort()
rsort()
asort()
arsort()
ksort()
krsort()
json_encode()
json_decode()
base64_encode()
base64_decode()
$_COOKIE[]
$_POST[]
$_GLOBALS[]
$_SERVER[]
get()
querystring()
file_get_contents()
file_put_contents()
die()
setcookie()
echo()
print()
print_r()
header()
unset()
