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PHP Array Functions

array_diff (arr1, arr2 ...)
array_­filter (arr, function)
array_flip (arr)
array_­int­ersect (arr1, arr2 ...)
array_­merge (arr1, arr2 ...)
array_pop (arr)
array_push (arr, var1, var2 ...)
array_­reverse (arr)
array_­search (needle, arr)
array_walk (arr, function)
count (count)
in_array (needle, haystack)

PHP String Functions

crypt (str, salt)
explode (sep, str)
implode (glue, arr)
nl2br (str)
sprintf (frmt, args)
strip_tags (str, allowe­d_tags)
str_re­place (search, replace, str)
strpos (str, needle)
strrev (str)
strstr (str, needle)
strtolower (str)
strtoupper (str)
substr (string, start, len)

PHP Filesystem Functions

clears­tat­cache ()
copy (source, dest)
fclose (handle)
fgets (handle, len)
file (file)
filemtime (file)
filesize (file)
file_e­xists (file)
fopen (file, mode)
fread (handle, len)
fwrite (handle, str)
readfile (file)

PHP Date and Time Functions

checkdate (month, day, year)
date (format, timestamp)
getdate (times­tamp)
mktime (hr, min, sec, month, day, yr)
strftime (forma­tst­ring, timestamp)
strtotime (str)
time ()

PHP Regular Expressions Functions

ereg (pattern, str)
split (pattern, str)
ereg_r­eplace (pattern, replace, str)
preg_grep (pattern, arr)
preg_match (pattern, str)
preg_m­atc­h_all (pattern, str, arr)
preg_r­eplace (pattern, replace, str)
preg_split (pattern, str)

Regular Expressions Syntax

^ Start of string
$ End of string
. Any single character
(a|b) a or b
(...) Group section
[abc] In range (a, b or c)
[^abc] Not in range
\s White space
a? Zero or one of a
a* Zero or more of a
a*? Zero or more, ungreedy
a+ One or more of a
a+? One or more, ungreedy
a{3} Exactly 3 of a
a{3,} 3 or more of a
a{,6} Up to 6 of a
a{3,6} 3 to 6 of a
a{3,6}? 3 to 6 of a, ungreedy
\ Escape character
[:punct:] Any punctu­ation symbol
[:space:] Any space character
[:blank:] Space or tab

There's an excellent regular expression tester at: http:/­/re­gex­

Pattern Modifiers

g Global match
i * Case-i­nse­nsitive
m * Multiple lines
s * Treat string as single line
x * Allow comments and whitespace in pattern
e * Evaluate replac­ement
U * Ungreedy pattern

* PCRE modifier


PHP fopen() Modes

r Read
r+ Read and write, prepend
w Write, truncate
w+ Read and write, truncate
a Write, append
a+ Read and write, append

PHP Date Formatting

Y 4 digit year (2008)
y 2 digit year (08)
F Long month (January)
M Short month (Jan)
m Month ⁴ (01 to 12)
n Month (1 to 12)
D Short day name (Mon)
l Long day name (Monday) (lowercase L)
d Day ⁴ (01 to 31)
j Day (1 to 31)
h 12 Hour ⁴ (01 to 12)
g 12 Hour (1 to 12)
H 24 Hour ⁴ (00 to 23)
G 24 Hour (0 to 23)
i Minutes ⁴ (00 to 59)
s Seconds ⁴ (00 to 59)
w Day of week ¹ (0 to 6)
z Day of year (0 to 365)
W Week of year ² (1 to 53)
t Days in month (28 to 31)
a am or pm
A AM or PM
B Swatch Internet Time (000 to 999)
S Ordinal Suffix (st, nd, rd, th)
T Timezone of machine (GMT)
Z Timezone offset (seconds)
O GMT offset (hours) (+0200)
I Daylight saving (1 or 0)
L Leap year (1 or 0)
U Seconds since Epoch ³
c ISO 8601 (PHP 5) (2008-­07-­31T­18:­30:­13+­01:00)
r RFC 2822 (Thu, 31 Jul 2008 18:30:13 +0100)

¹ 0 is Sunday, 6 is Saturday.
² 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 be 53 if week belongs to previous year. date("W­", mktime(0, 0, 0, 12, 8, $year)) always gives correct number of weeks in $year.
³ The Epoch is the 1st January 1970.
⁴ With leading zeroes


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localwebdesign localwebdesign, 10:02 28 Nov 11


Thanks for adding these. They rock! the mysql and php ones are my faves. Found your site by searching for a SQL Server cheatsheet.

all of them are great!

Now to dream up one of my own to share. ;0)

Anan Anan, 12:17 7 Dec 11

Hi Dave!
I recently started learning html,php,mysql and I found your cheatsheets very helpful and also the four security lessons on Php scripting(addedbytes).

thanks alot,
with bllesings from aboce


alan alan, 07:46 5 Jan 12

this is better, got some ajax accordion function for clicking

Fishtankalpha Fishtankalpha, 13:11 5 Jan 12

There is a lot missing.

DaveChild DaveChild, 13:12 5 Jan 12

Well, yes. It's a quick reference, not a manual :).

xcession xcession, 18:23 14 Mar 12

Nice Thanks :)
btw, can you make it a bit more compact? because table break into separated page when download as PDF.

Isaac Isaac, 13:28 14 May 12

What good is this cheat sheet? It has function names and no descriptions or examples?

Is this a wordpress website? WTF!

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