Index: api.css
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/api/api.css,v
retrieving revision 1.15.2.2
diff -u -p -r1.15.2.2 api.css
--- api.css	28 Jan 2009 21:05:03 -0000	1.15.2.2
+++ api.css	6 Jun 2009 01:04:13 -0000
@@ -37,6 +37,10 @@ html.js div.api-expandable div.content {
   color: #060;
 }
 
+.line-count {
+  color: #aaa;
+}
+
 /* Lists */
 dl.api-related-topics dt {
   clear: both;
Index: parser.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/api/parser.inc,v
retrieving revision 1.41.2.1
diff -u -p -r1.41.2.1 parser.inc
--- parser.inc	28 Jan 2009 21:35:50 -0000	1.41.2.1
+++ parser.inc	6 Jun 2009 01:04:13 -0000
@@ -598,8 +598,6 @@ function api_documentation_summary($docu
  * Colorize and format a PHP script.
  */
 function api_format_php($code) {
-  $output = '';
-
   if (!defined('T_ML_COMMENT')) {
     define('T_ML_COMMENT', T_COMMENT);
   }
@@ -610,6 +608,8 @@ function api_format_php($code) {
   $tokens = token_get_all($code);
 
   $in_string = FALSE;
+  $output = _api_format_php_line_count_format(1);
+  $line_count = 2;
 
   foreach ($tokens as $token) {
     if ($in_string) {
@@ -631,6 +631,7 @@ function api_format_php($code) {
     if (is_array($token)) {
       $type = $token[0];
       $value = htmlspecialchars($token[1]);
+      _api_format_php_line_count($value, $line_count);
 
       switch ($type) {
         case T_OPEN_TAG:
@@ -688,7 +689,25 @@ function api_format_php($code) {
   }
 
   // Manage whitespace:
-  return '<pre class="php"><code>'. trim($output) .'</code></pre>';
+  return '<pre class="php"><code>'. $output .'</code></pre>';
+}
+
+/**
+ * Insert line numbers where line breaks occur in code.
+ */
+function _api_format_php_line_count(&$code, &$line_count) {
+  $pos = 0;
+  while (($pos = strpos($code, PHP_EOL, $pos)) !== FALSE) {
+    $code = substr($code, 0, ++$pos) . _api_format_php_line_count_format($line_count, $pos) . substr($code, $pos++);
+    $line_count++;
+  }
+}
+
+/**
+ * Format a line number into a string
+ */
+function _api_format_php_line_count_format($line_count) {
+  return '<span class="line-count">' . str_pad($line_count, 4, " ", STR_PAD_LEFT) . '.  </span>';
 }
 
 /**