< ?php
/*
Plugin Name: PHP Syntax Highlighter
Plugin URI: http://www.UGiA.cn
Description: highlight u php Syntax
Version: 0.1
Author: legend
Author URI: http://www.ugia.cn/
*/

function highlight_php($code)
{
	// remove empty codes
	if (trim($code) == '')
	{
		return '';
	}

	//remove smilies
	$code = str_replace('"', '"', $code);

	if (!is_array($codefind))
	{
		$codefind1 = array(
			'<br>',		// <br /> to nothing
			'<br />'	// <br /> to nothing
		);
		$codereplace1 = array(
			'',
			''
		);

		$codefind2 = array(
			'&gt;',		// &gt; to >
			'&lt;',		// &lt; to < '&quot;',	// &quot; to ",
			'&amp;',	// &amp; to &
		);
		$codereplace2 = array(
			'>',
			'< ',
			'"',
			'&',
		);
	}

	// remove htmlspecialchars'd bits and excess spacing
	$code = trim(str_replace($codefind1, $codereplace1, $code));
	$code = str_replace($codefind2, $codereplace2, $code); // finish replacements

	// do we have an opening <? tag?
	if (!preg_match('#^\s*<\s?\?#si', $code))
	{
		// if not, replace leading newlines and stuff in a <?php tag and a closing tag at the end
		$code = "<?php BEGIN__PHP_SYNTAX_HIGLIGHTER $code \r\nEND__PHP_SYNTAX_HIGLIGHTER ?>";
		$addedtags = true;
	}
	else
	{
		$addedtags = false;
		$code = preg_replace("/^\s*< \s\?/isU", "<?", $code);
		$code = preg_replace("/<\/>$/isU", "", $code);
	}


	// highlight the string
	$oldlevel = error_reporting(0);
	if (PHP_VERSION  >= '4.2.0')
	{
		$buffer = highlight_string($code, fals);
	}
	else
	{
		@ob_start();
		highlight_string($code);
		$buffer = @ob_get_contents();
		@ob_end_clean();
	}
	error_reporting($oldlevel);

	// if we added tags above, now get rid of them from the resulting string
	if ($addedtags)
	{
		$buffer = preg_replace(array(
			'#(< |&lt;)\?.*php( |&nbsp;)BEGIN__PHP_SYNTAX_HIGLIGHTER #siU',
			'#END__PHP_SYNTAX_HIGLIGHTER( |&nbsp;)\?(>|&gt;)#siU'
		), '', $buffer);
	}
	$buffer = str_replace('[', '&#91;', $buffer);
	$buffer = preg_replace("/< \/?code>/isU", "", $buffer);
	$buffer = preg_replace('/&amp;#([0-9]+);/', '&#$1;', $buffer); // allow unicode entities back through
	$buffer = preg_replace('/<font COLOR="#/i', '<span class="php_', $buffer);
    $buffer = preg_replace('/<\/FONT>/i', '', $buffer);	
	
	$code = &$buffer;

	return $code;
}

if (function_exists('add_filter')) {
    function __php_syntax_hilight($content)
    {
        return preg_replace_callback("/<pre ([^>]*)>(.*?)< \/pre>/is",
                                     '__php_syntax_hilight_callback',
                                     $content);
    }

    function __php_syntax_hilight_callback($match)
    {
        $attr = $match[1];
        $code = $match[2];
         
        $code = str_replace("<br />", "", $code);
        $code = preg_replace("/\s*<p>/s", "\r\n\r\n", $code);
        $code = preg_replace("/< \/p>/s", "", $code);
        $code = str_replace("&#8220;", '"', $code);
        $code = str_replace("&#8221;", '"', $code);
        $code = str_replace("&#8216;", "'", $code);
        $code = str_replace("&#8217;", "'", $code);
        $code = str_replace("&#8211;", "--", $code);
               
        // Try to match the <pre lang="..."> tag, to determine what
        // programming language we need to hilight for,
        
        $re_lang = '/\s+lang\s*=\s*["']?([^"']+)["']?/xi';
        $num = preg_match($re_lang, $attr, $lang);
        if ($num)
        {
            $code = highlight_php($code);
            $attr = preg_replace($re_lang, '', $attr);
            return $lang[1] == "php" ? "<div class="php_code">".$code."</div>" : "&lt;pre$attr>$code&lt;/pre&gt;";
        }
        else
        {
            return "</pre><pre $attr>$code&lt;/pre&gt;";
        }
        //return "</pre><pre $attr>$code&lt;/pre&gt;";
        //return $return;

    }

    add_filter('the_content', '__php_syntax_hilight');
}
?>