recode
Introduction
Human Language and Character Encoding Support
PHP Manual
Unicode
Introduction
Installing/Configuring
Requirements
Installation
Runtime Configuration
Resource Types
Predefined Constants
Unicode Functions
unicode_decode
— Convert a binary string into a Unicode string
unicode_encode
— Convert a unicode string in any encoding
unicode_get_error_mode
— Get the error mode for strings conversions
unicode_get_subst_char
— Get the substitution character for string conversion errors
unicode_set_error_mode
— Set the error mode for strings conversions
unicode_set_subst_char
— Set the substitution character for string conversion errors
recode
Introduction
Human Language and Character Encoding Support
PHP Manual