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# CLI. String Functions

# Introduction

These functions all manipulate strings in various ways. Some more specialized sections can be found in the regular expression and URL handling sections.

For information on how strings behave, especially with regard to usage of single quotes, double quotes, and escape sequences, see the Strings entry in the Types section of the manual.

# Requirements

No external libraries are needed to build this extension.

# Installation

There is no installation needed to use these functions; they are part of the PHP core.

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`CRYPT_SALT_LENGTH` integer

`CRYPT_STD_DES` integer

`CRYPT_EXT_DES` integer

`CRYPT_MD5` integer

`CRYPT_BLOWFISH` integer

`HTML_SPECIALCHARS` (integer)

`HTML_ENTITIES` (integer)

`ENT_COMPAT` (integer)

`ENT_QUOTES` (integer)

`ENT_NOQUOTES` (integer)

`CHAR_MAX` (integer)

`LC_CTYPE` (integer)

`LC_NUMERIC` (integer)

`LC_TIME` (integer)

`LC_COLLATE` (integer)

`LC_MONETARY` (integer)

`LC_ALL` (integer)

`LC_MESSAGES` (integer)

`STR_PAD_LEFT` (integer)

`STR_PAD_RIGHT` (integer)

`STR_PAD_BOTH` (integer)

# See Also

For even more powerful string handling and manipulating functions take a look at the POSIX regular expression functions and the Perl compatible regular expression functions.

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