Available free from AddedBytes.com

Arrays

array_intersect

array_merge

array_pop

array_push

array_reverse

array_walk

count

in_array

Date and Time

date

mktime

strtotime

time

Filesystem

clearstatcache

copy

fclose

fgets

file

filemtime

filesize

file_exists

fopen

fread

fwrite

is_dir

is_file

readfile

Headers

header

headers_sent

setcookie

Mail

mail

Numbers

ceil

floor

number_format

round

Miscellaneous

define

eval

exit

Network

fsockopen

PHP Options

ini_get

ini_restore

ini_set

phpinfo

Execution

exec

Regex
ereg
eregi
ereg_replace
eregi_replace
split
spliti
preg_match
preg_match_all
preg_replace
preg_split

Sessions
session_destroy
session_id
session_start

Strings
addslashes
crypt
echo
explode
implode
md5
nl2br
sprintf
strip_tags
stripslashes
stristr
strpos
strrev
strstr
strtolower
strtoupper
str_replace
substr
trim

URLs
rawurldecode
rawurlencode
urldecode
urlencode

Variables
empty
is_array
is_int
is_null
is_numeric
is_object
isset
serialize
unserialize

SuperGlobals
$_ENV
$_GET
$_POST
$_COOKIE
$_SESSION
$_SERVER
$_FILES
$_REQUEST
$GLOBALS

DATE FORMATTING

Y
y
F

M

m

n

D

l

d

j

h
g

H
G

i

s

w

z

W

t

a

A
B
S

T

Z

O

I

L

U

c

r

4 digit year
2 digit year
Long month
Short month
Month (leading zeros)
Month
Short day name
Long day name
Day (leading zeros)
Day

12 Hour (leading zeros)
12 Hour
24 Hour (leading zeros)
24 Hour
Minutes (leading zeros)
Seconds (leading zeros)

Day of week

1

Day of year
Week of year

2

Days in month

Swatch Internet Time
Ordinal Suffix

Timezone of machine

Timezone offset (seconds)

Difference to GMT (hours)
Daylight savings
Leap year

Seconds since Epoch

3

ISO 8601 (PHP 5)
RFC 2822

2005
05
January
Jan
01 to 12
1 to 12
Mon
Monday
01 to 31
1 to 31

01 to 12
1 to 12
00 to 23
0 to 23
00 to 59
00 to 59

0 to 6
0 to 365
1 to 53
28 to 31

am or pm
AM or PM
000 to 999
st, nd, td, th

GMT

+0200
1 or 0
1 or 0

date("w"): 0 is Sunday, 6 is Saturday.

Week that overlaps two years belongs to
year that contains most days of that
week. Hence week number for 1st January
of a given year can return 53rd week if
week belongs to previous year.
date("W", mktime(0, 0, 0, 12, 28, $year))
always gives correct number of weeks in
$year.

The Epoch was the 1st January 1970.

1.

2.

3.

REGULAR EXPRESSION SYNTAX

^
$
.
(a|b)
(...)
[abc]
[^abc]
\s
a?
a*
a+
a{3}
a{3,}
a{3,6}
\

[:punct:]
[:space:]
[:blank:]

Start of string
End of string
Any single character
a or b
Group section
Item in range (a or b or c)
Not in range (not a or b or c)

White space

Zero or one of a
Zero or more of a
One or more of a
Exactly 3 of a
3 or more of a
Between 3 and 6 of a
Escape character

Any punctuation symbol
Any space character
Space or tab

fopen() MODES

r
r+
w
w+
a
a+

Read
Read and write, prepend
Write, truncate
Read and write, truncate
Write, append
Read and write, append

FUNCTION ARGUMENT ORDERS

array_push ( array, element )
in_array ( needle, haystack )
explode (

separator,

string )

split ( pattern, string )
preg_split ( pattern, string )
ereg ( pattern, string )
strpos ( haystack, needle )

str_replace

( search, replace, string )

PCRE MODIFIERS

i
s
m
U
e
x

Case-insensitive
Period matches newline
^ and $ match lines
Ungreedy matching
Evaluate replacement

Pattern over several lines