useful php functions/cheat sheet

Posted by bput4all on October 17, 2012 · 2 Comments 

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:/­/re­gex­pal.com/

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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