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libraries/phputf8/utf8.php

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+<?php
+/**
+* This is the dynamic loader for the library. It checks whether you have
+* the mbstring extension available and includes relevant files
+* on that basis, falling back to the native (as in written in PHP) version
+* if mbstring is unavailabe.
+*
+* It's probably easiest to use this, if you don't want to understand
+* the dependencies involved, in conjunction with PHP versions etc. At
+* the same time, you might get better performance by managing loading
+* yourself. The smartest way to do this, bearing in mind performance,
+* is probably to "load on demand" - i.e. just before you use these
+* functions in your code, load the version you need.
+*
+* It makes sure the the following functions are available;
+* utf8_strlen, utf8_strpos, utf8_strrpos, utf8_substr,
+* utf8_strtolower, utf8_strtoupper
+* Other functions in the ./native directory depend on these
+* six functions being available
+* @package utf8
+*/
+
+/**
+* Put the current directory in this constant
+*/
+if ( !defined('UTF8') ) {
+    define('UTF8',dirname(__FILE__));
+}
+
+/**
+* If string overloading is active, it will break many of the
+* native implementations. mbstring.func_overload must be set
+* to 0, 1 or 4 in php.ini (string overloading disabled).
+* Also need to check we have the correct internal mbstring
+* encoding
+*/
+if ( extension_loaded('mbstring')) {
+    if ( ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING ) {
+        trigger_error('String functions are overloaded by mbstring',E_USER_ERROR);
+    }
+    mb_internal_encoding('UTF-8');
+}
+
+/**
+* Check whether PCRE has been compiled with UTF-8 support
+*/
+$UTF8_ar = array();
+if ( preg_match('/^.{1}$/u',"ñ",$UTF8_ar) != 1 ) {
+    trigger_error('PCRE is not compiled with UTF-8 support',E_USER_ERROR);
+}
+unset($UTF8_ar);
+
+
+/**
+* Load the smartest implementations of utf8_strpos, utf8_strrpos
+* and utf8_substr
+*/
+if ( !defined('UTF8_CORE') ) {
+    if ( function_exists('mb_substr') ) {
+        require_once UTF8 . '/mbstring/core.php';
+    } else {
+        require_once UTF8 . '/utils/unicode.php';
+        require_once UTF8 . '/native/core.php';
+    }
+}
+
+/**
+* Load the native implementation of utf8_substr_replace
+*/
+require_once UTF8 . '/substr_replace.php';
+
+/**
+* You should now be able to use all the other utf_* string functions
+*/