Programming PHP, 2nd Edition

PHP Functions by Category

This is a list of functions provided by PHP’s built-in extensions, grouped by category. Some functions fall under more than one header.

Arrays

array

array_merge_recursive

array_uintersect_assoc

array_chunk

array_multisort

array_uintersect_uassoc

array_combine

array_pad

array_unique

array_count_values

array_pop

array_unshift

array_diff

array_push

array_values

array_diff_assoc

array_rand

array_walk

array_diff_uassoc

array_reduce

array_walk_recursive

array_fill

array_reverse

arsort

array_filter

array_search

asort

array_flip

array_shift

compact

array_intersect

array_slice

count

array_intersect_assoc

array_splice

current

array_intersect_uassoc

array_sum

each

array_key_exists

array_udiff

end

array_keys

array_udiff_assoc

explode

array_map

array_udiff_uassoc

extract

array_merge

array_uintersect

implode

in_array

natsort

shuffle

key

next

sizeof

key_exists

pos

sort

krsort

prev

uasort

ksort

range

uksort

list

reset

usort

natcasesort

rsort

Classes and Objects

call_user_method

call_user_method_array

class_exists

get_class

get_class_methods

get_class_vars

get_declared_classes

get_declared_interfaces

get_object_vars

get_parent_class

is_subclass_of

method_exists

Date and Time

checkdate

date

getdate

gettimeofday

gmdate

gmmktime

gmstrftime

localtime

microtime

mktime

strftime

strtotime

time

Errors and Logging

assert

assert_options

closelog

crc32

define_syslog_variables

error_log

error_reporting

openlog

restore_error_handler

set_error_handler

syslog

trigger_error

user_error

Files, Directories, and Filesystem

basename

fileinode

is_writable

chdir

filemtime

is_writeable

chgrp

fileowner

link

chmod

fileperms ...