WordPress4.2升级修复补丁：解决大量404请求以及评论表情路径及尺寸异常问题

<style type="text/css">
img.wp-smiley,
img.emoji {
	display: inline !important;
	border: none !important;
	box-shadow: none !important;
	height: 1em !important;
	width: 1em !important;
	margin: 0 .07em !important;
	vertical-align: -0.1em !important;
	background: none !important;
	padding: 0 !important;
}
</style>

<?php
/**
 * 修复WordPress升级4.2带来的各种问题 By 张戈博客
 * 原文地址①：http://zhangge.net/5034.html 
 * 原文地址②：http://zhangge.net/5035.html
 * 修复说明：
 * ①、部分主题出现大量404请求
 * ②、修复表情路径异常问题
 * ③、后续遇到问题将继续更新
 * */
remove_action( 'wp_head','print_emoji_detection_script',7);     //解决4.2版本部分主题大量404请求问题
remove_action('admin_print_scripts', 'print_emoji_detection_script'); //解决后台404请求
remove_action( 'init',       'smilies_init',               5);  //移除4.2版本表情钩子
remove_action( 'wp_print_styles',   'print_emoji_styles'    );  //移除4.2版本前台表情样式钩子
remove_action( 'admin_print_styles',    'print_emoji_styles');  //移除4.2版本后台表情样式钩子
remove_action( 'the_content_feed',      'wp_staticize_emoji');  //移除4.2 emoji相关钩子
remove_action( 'comment_text_rss',      'wp_staticize_emoji');  //移除4.2 emoji相关钩子
remove_action( 'comment_text',      'convert_smilies',   20 );  //移除4.2 表情相关钩子
remove_action( 'the_content',           'convert_smilies'   );  //移除4.2 表情相关钩子
remove_action( 'the_excerpt',            'convert_smilies'  );  //移除4.2 表情相关钩子
 
add_action( 'comment_text',     'convert_smilies_diy',    20);  //自定义表情相关钩子
add_action( 'the_content',          'convert_smilies_diy'   );  //自定义表情相关钩子
add_action( 'the_excerpt',      'convert_smilies_diy'       );  //自定义表情相关钩子
add_action( 'init',         'smilies_init_old',     5       );  //自定义表情钩子
 
//原函数 smilies_init 位于wp-includes/functions.php
function smilies_init_old() {
	global $wpsmiliestrans, $wp_smiliessearch;
	// don't bother setting up smilies if they are disabled
	if ( !get_option( 'use_smilies' ) )
		return;
	if ( !isset( $wpsmiliestrans ) ) {
		$wpsmiliestrans = array(
		':mrgreen:' => 'icon_mrgreen.gif',
		':neutral:' => 'icon_neutral.gif',
		':twisted:' => 'icon_twisted.gif',
		  ':arrow:' => 'icon_arrow.gif',
		  ':shock:' => 'icon_eek.gif',
		  ':smile:' => 'icon_smile.gif',
		    ':???:' => 'icon_confused.gif',
		   ':cool:' => 'icon_cool.gif',
		   ':evil:' => 'icon_evil.gif',
		   ':grin:' => 'icon_biggrin.gif',
		   ':idea:' => 'icon_idea.gif',
		   ':oops:' => 'icon_redface.gif',
		   ':razz:' => 'icon_razz.gif',
		   ':roll:' => 'icon_rolleyes.gif',
		   ':wink:' => 'icon_wink.gif',
		    ':cry:' => 'icon_cry.gif',
		    ':eek:' => 'icon_surprised.gif',
		    ':lol:' => 'icon_lol.gif',
		    ':mad:' => 'icon_mad.gif',
		    ':sad:' => 'icon_sad.gif',
		      '8-)' => 'icon_cool.gif',
		      '8-O' => 'icon_eek.gif',
		      ':-(' => 'icon_sad.gif',
		      ':-)' => 'icon_smile.gif',
		      ':-?' => 'icon_confused.gif',
		      ':-D' => 'icon_biggrin.gif',
		      ':-P' => 'icon_razz.gif',
		      ':-o' => 'icon_surprised.gif',
		      ':-x' => 'icon_mad.gif',
		      ':-|' => 'icon_neutral.gif',
		      ';-)' => 'icon_wink.gif',
		// This one transformation breaks regular text with frequency.
		//     '8)' => 'icon_cool.gif',
		       '8O' => 'icon_eek.gif',
		       ':(' => 'icon_sad.gif',
		       ':)' => 'icon_smile.gif',
		       ':?' => 'icon_confused.gif',
		       ':D' => 'icon_biggrin.gif',
		       ':P' => 'icon_razz.gif',
		       ':o' => 'icon_surprised.gif',
		       ':x' => 'icon_mad.gif',
		       ':|' => 'icon_neutral.gif',
		       ';)' => 'icon_wink.gif',
		      ':!:' => 'icon_exclaim.gif',
		      ':?:' => 'icon_question.gif',
		);
	}
	if (count($wpsmiliestrans) == 0) {
		return;
	}
	/*
	 * NOTE: we sort the smilies in reverse key order. This is to make sure
	 * we match the longest possible smilie (:???: vs :?) as the regular
	 * expression used below is first-match
	 */
	krsort($wpsmiliestrans);
	$spaces = wp_spaces_regexp();
	// Begin first "subpattern"
	$wp_smiliessearch = '/(?<=' . $spaces . '|^)';
	$subchar = '';
	foreach ( (array) $wpsmiliestrans as $smiley => $img ) {
		$firstchar = substr($smiley, 0, 1);
		$rest = substr($smiley, 1);
		// new subpattern?
		if ($firstchar != $subchar) {
			if ($subchar != '') {
				$wp_smiliessearch .= ')(?=' . $spaces . '|$)';  // End previous "subpattern"
				$wp_smiliessearch .= '|(?<=' . $spaces . '|^)'; // Begin another "subpattern"
			}
			$subchar = $firstchar;
			$wp_smiliessearch .= preg_quote($firstchar, '/') . '(?:';
		} else {
			$wp_smiliessearch .= '|';
		}
		$wp_smiliessearch .= preg_quote($rest, '/');
	}
 
	$wp_smiliessearch .= ')(?=' . $spaces . '|$)/m';
}
//原函数 convert_smilies 位于wp-includes/formatting.php
function convert_smilies_diy( $text ) {
	global $wp_smiliessearch;
	$output = '';
	if ( get_option( 'use_smilies' ) && ! empty( $wp_smiliessearch ) ) {
		// HTML loop taken from texturize function, could possible be consolidated
		$textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // capture the tags as well as in between
		$stop = count( $textarr );// loop stuff
		// Ignore proessing of specific tags
		$tags_to_ignore = 'code|pre|style|script|textarea';
		$ignore_block_element = '';
		for ( $i = 0; $i < $stop; $i++ ) {
			$content = $textarr[$i];
			// If we're in an ignore block, wait until we find its closing tag
			if ( '' == $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')>/', $content, $matches ) )  {
				$ignore_block_element = $matches[1];
			}
			// If it's not a tag and not in ignore block
			if ( '' ==  $ignore_block_element && strlen( $content ) > 0 && '<' != $content[0] ) {
				$content = preg_replace_callback( $wp_smiliessearch, 'translate_smiley_diy', $content );
			}
			// did we exit ignore block
			if ( '' != $ignore_block_element && '</' . $ignore_block_element . '>' == $content )  {
				$ignore_block_element = '';
			}
			$output .= $content;
		}
	} else {
		// return default text.
		$output = $text;
	}
	return $output;
}
//原函数 translate_smiley 位于wp-includes/formatting.php
function translate_smiley_diy( $matches ) {
	global $wpsmiliestrans;
	if ( count( $matches ) == 0 )
		return '';
	$smiley = trim( reset( $matches ) );
	$img = $wpsmiliestrans[ $smiley ];
	$matches = array();
	$ext = preg_match( '/\.([^.]+)$/', $img, $matches ) ? strtolower( $matches[1] ) : false;
	$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
	// Don't convert smilies that aren't images - they're probably emoji.
	if ( ! in_array( $ext, $image_exts ) ) {
		return $img;
	}
	/**
	 * Filter the Smiley image URL before it's used in the image element.
	 *
	 * @since 2.9.0
	 *
	 * @param string $smiley_url URL for the smiley image.
	 * @param string $img        Filename for the smiley image.
	 * @param string $site_url   Site URL, as returned by site_url().
	 */
        //请注意！已将表情路径定义到主题目录下的 images/smilies 文件夹
	$src_url = apply_filters( 'smilies_src', get_bloginfo('template_directory').'/images/smilies/'.$img, $img, site_url() );
	return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="/*height: 1em; max-height: 1em;*/" />', esc_url( $src_url ), esc_attr( $smiley )         );
    }
?>

//4.2 修复补丁，请注意 patch_to_4.2.php 路径是否正确。
include("patch_to_4.2.php");