From f106142a9ba246fba79da405986bf8ac706914d5 Mon Sep 17 00:00:00 2001
From: Andrew Nacin <wp@andrewnacin.com>
Date: Tue, 9 Jul 2013 05:23:53 +0000
Subject: [PATCH] Avoid getting tripped up on post content that starts with
 <!--nextpage-->. props SergeyBiryukov. fixes #16746.

git-svn-id: http://core.svn.wordpress.org/trunk@24599 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/query.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/wp-includes/query.php b/wp-includes/query.php
index fd93c525bd..04286aa517 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -3656,12 +3656,15 @@ function setup_postdata( $post ) {
 	if ( is_single() || is_page() || is_feed() )
 		$more = 1;
 	$content = $post->post_content;
-	if ( strpos( $content, '<!--nextpage-->' ) ) {
+	if ( false !== strpos( $content, '<!--nextpage-->' ) ) {
 		if ( $page > 1 )
 			$more = 1;
 		$content = str_replace( "\n<!--nextpage-->\n", '<!--nextpage-->', $content );
 		$content = str_replace( "\n<!--nextpage-->", '<!--nextpage-->', $content );
 		$content = str_replace( "<!--nextpage-->\n", '<!--nextpage-->', $content );
+		// Ignore nextpage at the beginning of the content.
+		if ( 0 === strpos( $content, '<!--nextpage-->' ) )
+			$content = substr( $content, 15 );
 		$pages = explode('<!--nextpage-->', $content);
 		$numpages = count($pages);
 		if ( $numpages > 1 )