- array_first
- array_flip
- array_key_exists
- array_key_first
- array_key_last
- array_keys
- array_last
- array_pop
- array_push
- array_rand
- count
- key_exists
- ctype_alnum
- ctype_alpha
- ctype_cntrl
- ctype_digit
- ctype_graph
- ctype_lower
- ctype_print
- ctype_punct
- ctype_space
- ctype_upper
- ctype_xdigit
- class_alias
- class_exists
- get_class
- get_class_methods
- get_class_vars
- get_declared_classes
- get_declared_interfaces
- get_parent_class
- is_a
- is_subclass_of
- method_exists
- property_exists
- checkdate
- date
- getdate
- localtime
- microtime
- mktime
- time
- getcwd
- error_reporting
- file_exists
- file_get_contents
- is_dir
- is_file
- is_uploaded_file
- rename
- function_exists
- abs
- acos
- acosh
- asin
- asinh
- clamp
- pi
- constant
- define
- defined
- highlight_string
- getenv
- getmygid
- getmypid
- getmyuid
- ini_get
- ini_set
- phpinfo
- phpversion
- zend_thread_id
- zend_version
- ob_clean
- ob_end_clean
- ob_end_flush
- ob_flush
- ob_get_clean
- ob_get_contents
- ob_get_flush
- ob_get_length
- ob_get_level
- ob_start
- bin2hex
- chr
- hex2bin
- implode
- join
- lcfirst
- md5
- nl2br
- quotemeta
- sha1
- str_contains
- str_ends_with
- str_repeat
- str_starts_with
- strlen
- strtolower
- strtoupper
- substr
- ucfirst
- boolval
- doubleval
- floatval
- get_debug_type
- gettype
- intval
- is_array
- is_bool
- is_double
- is_float
- is_int
- is_integer
- is_long
- is_null
- is_object
- is_scalar
- is_string
- print_r
- serialize
- strval
- unserialize
- var_dump
- var_export