1 files changed, 145 insertions, 0 deletions
diff --git a/www/utf8_to_ascii/utf8_to_ascii.php b/www/utf8_to_ascii/utf8_to_ascii.php
new file mode 100644
index 0000000..3dfdf19
--- /dev/null
+++ b/www/utf8_to_ascii/utf8_to_ascii.php
@@ -0,0 +1,145 @@
+<?php
+/**
+* US-ASCII transliterations of Unicode text
+* @version $Id: utf8_to_ascii.php,v 1.1 2009-11-25 23:43:14 philipp Exp $
+* @package utf8_to_ascii
+*/
+
+if ( !defined('UTF8_TO_ASCII_DB') ) {
+    define('UTF8_TO_ASCII_DB',dirname(__FILE__).'/db');
+}
+
+//--------------------------------------------------------------------
+/**
+* US-ASCII transliterations of Unicode text
+* Ported Sean M. Burke's Text::Unidecode Perl module (He did all the hard work!)
+* Warning: you should only pass this well formed UTF-8!
+* Be aware it works by making a copy of the input string which it appends transliterated
+* characters to - it uses a PHP output buffer to do this - it means, memory use will increase,
+* requiring up to the same amount again as the input string
+* @see http://search.cpan.org/~sburke/Text-Unidecode-0.04/lib/Text/Unidecode.pm
+* @param string UTF-8 string to convert
+* @param string (default = ?) Character use if character unknown
+* @return string US-ASCII string
+* @package utf8_to_ascii
+*/
+function utf8_to_ascii($str, $unknown = '?') {
+    
+    # The database for transliteration stored here
+    static $UTF8_TO_ASCII = array();
+    
+    # Variable lookups faster than accessing constants
+    $UTF8_TO_ASCII_DB = UTF8_TO_ASCII_DB;
+    
+    if ( strlen($str) == 0 ) { return ''; }
+    
+    $len = strlen($str);
+    $i = 0;
+    
+    # Use an output buffer to copy the transliterated string
+    # This is done for performance vs. string concatenation - on my system, drops
+    # the average request time for the example from ~0.46ms to 0.41ms
+    # See http://phplens.com/lens/php-book/optimizing-debugging-php.php
+    # Section  "High Return Code Optimizations"
+    ob_start();
+    
+    while ( $i < $len ) {
+        
+        $ord = NULL;
+        $increment = 1;
+        
+        $ord0 = ord($str{$i});
+        
+        # Much nested if /else - PHP fn calls expensive, no block scope...
+        
+        # 1 byte - ASCII
+        if ( $ord0 >= 0 && $ord0 <= 127 ) {
+            
+            $ord = $ord0;
+            $increment = 1;
+            
+        } else {
+            
+            # 2 bytes
+            $ord1 = ord($str{$i+1});
+            
+            if ( $ord0 >= 192 && $ord0 <= 223 ) {
+                
+                $ord = ( $ord0 - 192 ) * 64 + ( $ord1 - 128 );
+                $increment = 2;
+                
+            } else {
+                
+                # 3 bytes
+                $ord2 = ord($str{$i+2});
+                
+                if ( $ord0 >= 224 && $ord0 <= 239 ) {
+                    
+                    $ord = ($ord0-224)*4096 + ($ord1-128)*64 + ($ord2-128);
+                    $increment = 3;
+                    
+                } else {
+                    
+                    # 4 bytes
+                    $ord3 = ord($str{$i+3});
+                    
+                    if ($ord0>=240 && $ord0<=247) {
+                        
+                        $ord = ($ord0-240)*262144 + ($ord1-128)*4096 
+                            + ($ord2-128)*64 + ($ord3-128);
+                        $increment = 4;
+                        
+                    } else {
+                        
+                        ob_end_clean();
+                        trigger_error("utf8_to_ascii: looks like badly formed UTF-8 at byte $i");
+                        return FALSE;
+                        
+                    }
+                    
+                }
+                
+            }
+            
+        }
+        
+        $bank = $ord >> 8;
+        
+        # If we haven't used anything from this bank before, need to load it...
+        if ( !array_key_exists($bank, $UTF8_TO_ASCII) ) {
+            
+            $bankfile = UTF8_TO_ASCII_DB. '/'. sprintf("x%02x",$bank).'.php';
+            
+            if ( file_exists($bankfile) ) {
+                
+                # Load the appropriate database
+                if ( !include  $bankfile ) {
+                    ob_end_clean();
+                    trigger_error("utf8_to_ascii: unable to load $bankfile");
+                }
+                
+            } else {
+                
+                # Some banks are deliberately empty
+                $UTF8_TO_ASCII[$bank] = array();
+                
+            }
+        }
+        
+        $newchar = $ord & 255;
+        
+        if ( array_key_exists($newchar, $UTF8_TO_ASCII[$bank]) ) {
+            echo $UTF8_TO_ASCII[$bank][$newchar];
+        } else {
+            echo $unknown;
+        }
+        
+        $i += $increment;
+        
+    }
+    
+    $str = ob_get_contents();
+    ob_end_clean();
+    return $str;
+    
+}