first commit

libraries/phputf8/ord.php

@@ -0,0 +1,92 @@
+<?php
+/**
+* @version $Id$
+* @package utf8
+* @subpackage strings
+*/
+
+//---------------------------------------------------------------
+/**
+* UTF-8 aware alternative to ord
+* Returns the unicode ordinal for a character
+* @param string UTF-8 encoded character
+* @return int unicode ordinal for the character
+* @see http://www.php.net/ord
+* @see http://www.php.net/manual/en/function.ord.php#46267
+*/
+function utf8_ord($chr) {
+
+    $ord0 = ord($chr);
+
+    if ( $ord0 >= 0 && $ord0 <= 127 ) {
+        return $ord0;
+    }
+
+    if ( !isset($chr{1}) ) {
+        trigger_error('Short sequence - at least 2 bytes expected, only 1 seen');
+        return FALSE;
+    }
+
+    $ord1 = ord($chr{1});
+    if ( $ord0 >= 192 && $ord0 <= 223 ) {
+        return ( $ord0 - 192 ) * 64
+            + ( $ord1 - 128 );
+    }
+
+    if ( !isset($chr{2}) ) {
+        trigger_error('Short sequence - at least 3 bytes expected, only 2 seen');
+        return FALSE;
+    }
+    $ord2 = ord($chr{2});
+    if ( $ord0 >= 224 && $ord0 <= 239 ) {
+        return ($ord0-224)*4096
+            + ($ord1-128)*64
+                + ($ord2-128);
+    }
+
+    if ( !isset($chr{3}) ) {
+        trigger_error('Short sequence - at least 4 bytes expected, only 3 seen');
+        return FALSE;
+    }
+    $ord3 = ord($chr{3});
+    if ($ord0>=240 && $ord0<=247) {
+        return ($ord0-240)*262144
+            + ($ord1-128)*4096
+                + ($ord2-128)*64
+                    + ($ord3-128);
+
+    }
+
+    if ( !isset($chr{4}) ) {
+        trigger_error('Short sequence - at least 5 bytes expected, only 4 seen');
+        return FALSE;
+    }
+    $ord4 = ord($chr{4});
+    if ($ord0>=248 && $ord0<=251) {
+        return ($ord0-248)*16777216
+            + ($ord1-128)*262144
+                + ($ord2-128)*4096
+                    + ($ord3-128)*64
+                        + ($ord4-128);
+    }
+
+    if ( !isset($chr{5}) ) {
+        trigger_error('Short sequence - at least 6 bytes expected, only 5 seen');
+        return FALSE;
+    }
+    if ($ord0>=252 && $ord0<=253) {
+        return ($ord0-252) * 1073741824
+            + ($ord1-128)*16777216
+                + ($ord2-128)*262144
+                    + ($ord3-128)*4096
+                        + ($ord4-128)*64
+                            + (ord($chr{5})-128);
+    }
+
+    if ( $ord0 >= 254 && $ord0 <= 255 ) {
+        trigger_error('Invalid UTF-8 with surrogate ordinal '.$ord0);
+        return FALSE;
+    }
+
+}
+