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Getting Started
Introduction
A simple tutorial
Language Reference
Basic syntax
Types
Variables
Constants
Expressions
Operators
Control Structures
Functions
Classes and Objects
Namespaces
Enumerations
Errors
Exceptions
Fibers
Generators
Attributes
References Explained
Predefined Variables
Predefined Exceptions
Predefined Interfaces and Classes
Predefined Attributes
Context options and parameters
Supported Protocols and Wrappers
Security
Introduction
General considerations
Installed as CGI binary
Installed as an Apache module
Session Security
Filesystem Security
Database Security
Error Reporting
User Submitted Data
Hiding PHP
Keeping Current
Features
HTTP authentication with PHP
Cookies
Sessions
Handling file uploads
Using remote files
Connection handling
Persistent Database Connections
Command line usage
Garbage Collection
DTrace Dynamic Tracing
Function Reference
Affecting PHP's Behaviour
Audio Formats Manipulation
Authentication Services
Command Line Specific Extensions
Compression and Archive Extensions
Cryptography Extensions
Database Extensions
Date and Time Related Extensions
File System Related Extensions
Human Language and Character Encoding Support
Image Processing and Generation
Mail Related Extensions
Mathematical Extensions
Non-Text MIME Output
Process Control Extensions
Other Basic Extensions
Other Services
Search Engine Extensions
Server Specific Extensions
Session Extensions
Text Processing
Variable and Type Related Extensions
Web Services
Windows Only Extensions
XML Manipulation
GUI Extensions
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PHP Manual
Function Reference
Text Processing
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Strings
Introduction
Installing/Configuring
Installation
Predefined Constants
String Functions
addcslashes
— Quote string with slashes in a C style
addslashes
— Quote string with slashes
bin2hex
— Convert binary data into hexadecimal representation
chop
— Alias of rtrim
chr
— Generate a single-byte string from a number
chunk_split
— Split a string into smaller chunks
convert_cyr_string
— Convert from one Cyrillic character set to another
convert_uudecode
— Decode a uuencoded string
convert_uuencode
— Uuencode a string
count_chars
— Return information about characters used in a string
crc32
— Calculates the crc32 polynomial of a string
crypt
— One-way string hashing
echo
— Output one or more strings
explode
— Split a string by a string
fprintf
— Write a formatted string to a stream
get_html_translation_table
— Returns the translation table used by htmlspecialchars and htmlentities
hebrev
— Convert logical Hebrew text to visual text
hebrevc
— Convert logical Hebrew text to visual text with newline conversion
hex2bin
— Decodes a hexadecimally encoded binary string
html_entity_decode
— Convert HTML entities to their corresponding characters
htmlentities
— Convert all applicable characters to HTML entities
htmlspecialchars
— Convert special characters to HTML entities
htmlspecialchars_decode
— Convert special HTML entities back to characters
implode
— Join array elements with a string
join
— Alias of implode
lcfirst
— Make a string's first character lowercase
levenshtein
— Calculate Levenshtein distance between two strings
localeconv
— Get numeric formatting information
ltrim
— Strip whitespace (or other characters) from the beginning of a string
md5
— Calculate the md5 hash of a string
md5_file
— Calculates the md5 hash of a given file
metaphone
— Calculate the metaphone key of a string
money_format
— Formats a number as a currency string
nl_langinfo
— Query language and locale information
nl2br
— Inserts HTML line breaks before all newlines in a string
number_format
— Format a number with grouped thousands
ord
— Convert the first byte of a string to a value between 0 and 255
parse_str
— Parses the string into variables
print
— Output a string
printf
— Output a formatted string
quoted_printable_decode
— Convert a quoted-printable string to an 8 bit string
quoted_printable_encode
— Convert a 8 bit string to a quoted-printable string
quotemeta
— Quote meta characters
rtrim
— Strip whitespace (or other characters) from the end of a string
setlocale
— Set locale information
sha1
— Calculate the sha1 hash of a string
sha1_file
— Calculate the sha1 hash of a file
similar_text
— Calculate the similarity between two strings
soundex
— Calculate the soundex key of a string
sprintf
— Return a formatted string
sscanf
— Parses input from a string according to a format
str_contains
— Determine if a string contains a given substring
str_decrement
— Decrement an alphanumeric string
str_ends_with
— Checks if a string ends with a given substring
str_getcsv
— Parse a CSV string into an array
str_increment
— Increment an alphanumeric string
str_ireplace
— Case-insensitive version of str_replace
str_pad
— Pad a string to a certain length with another string
str_repeat
— Repeat a string
str_replace
— Replace all occurrences of the search string with the replacement string
str_rot13
— Perform the rot13 transform on a string
str_shuffle
— Randomly shuffles a string
str_split
— Convert a string to an array
str_starts_with
— Checks if a string starts with a given substring
str_word_count
— Return information about words used in a string
strcasecmp
— Binary safe case-insensitive string comparison
strchr
— Alias of strstr
strcmp
— Binary safe string comparison
strcoll
— Locale based string comparison
strcspn
— Find length of initial segment not matching mask
strip_tags
— Strip HTML and PHP tags from a string
stripcslashes
— Un-quote string quoted with addcslashes
stripos
— Find the position of the first occurrence of a case-insensitive substring in a string
stripslashes
— Un-quotes a quoted string
stristr
— Case-insensitive strstr
strlen
— Get string length
strnatcasecmp
— Case insensitive string comparisons using a "natural order" algorithm
strnatcmp
— String comparisons using a "natural order" algorithm
strncasecmp
— Binary safe case-insensitive string comparison of the first n characters
strncmp
— Binary safe string comparison of the first n characters
strpbrk
— Search a string for any of a set of characters
strpos
— Find the position of the first occurrence of a substring in a string
strrchr
— Find the last occurrence of a character in a string
strrev
— Reverse a string
strripos
— Find the position of the last occurrence of a case-insensitive substring in a string
strrpos
— Find the position of the last occurrence of a substring in a string
strspn
— Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask
strstr
— Find the first occurrence of a string
strtok
— Tokenize string
strtolower
— Make a string lowercase
strtoupper
— Make a string uppercase
strtr
— Translate characters or replace substrings
substr
— Return part of a string
substr_compare
— Binary safe comparison of two strings from an offset, up to length characters
substr_count
— Count the number of substring occurrences
substr_replace
— Replace text within a portion of a string
trim
— Strip whitespace (or other characters) from the beginning and end of a string
ucfirst
— Make a string's first character uppercase
ucwords
— Uppercase the first character of each word in a string
utf8_decode
— Converts a string from UTF-8 to ISO-8859-1, replacing invalid or unrepresentable characters
utf8_encode
— Converts a string from ISO-8859-1 to UTF-8
vfprintf
— Write a formatted string to a stream
vprintf
— Output a formatted string
vsprintf
— Return a formatted string
wordwrap
— Wraps a string to a given number of characters
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