PHP Cheat Sheet
Complete reference for PHP functions, constants, and classes.
Resources
Array
Array Functions
- array()
- array_merge()
- array_push()
- array_pop()
- array_shift()
- array_unshift()
- array_keys()
- array_values()
- array_map()
- array_filter()
- in_array()
- array_key_exists()
- count()
- sort()
- rsort()
- asort()
- ksort()
- shuffle()
- array_slice()
- array_splice()
- array_unique()
- array_search()
- array_reverse()
- array_reduce()
- array_diff()
- array_intersect()
- array_combine()
- array_fill()
- range()
- explode()
- implode()
Array Constants
- CASE_LOWER
- CASE_UPPER
- SORT_ASC
- SORT_DESC
- SORT_REGULAR
- SORT_NUMERIC
- SORT_STRING
- COUNT_NORMAL
- COUNT_RECURSIVE
String
String Functions
- strlen()
- strpos()
- strrpos()
- substr()
- str_replace()
- str_ireplace()
- strtolower()
- strtoupper()
- ucfirst()
- ucwords()
- trim()
- ltrim()
- rtrim()
- md5()
- sha1()
- number_format()
- printf()
- sprintf()
- strip_tags()
- htmlspecialchars()
- htmlentities()
- nl2br()
- str_repeat()
- str_shuffle()
- str_split()
- str_word_count()
- strcmp()
- strcasecmp()
- strrev()
- strstr()
Variable Handling
Convert & Dump
MySQLi
Filesystem
Directory & Path
Date & Time
Constants
- DATE_ATOM
- DATE_COOKIE
- DATE_ISO8601
- DATE_RFC822
- DATE_RSS
- DATE_W3C
OOP (Magic Methods)
HTTP & Mail
Mail
Error Handling
Constants
- E_ERROR (Fatal)
- E_WARNING
- E_NOTICE
- E_ALL
- E_STRICT
Math
Misc, Filter & XML
Misc & Filter
SimpleXML & Zip