<?php

function get_ubb($str) {

//$str = preg_replace("/([)em(.*?)(])/i", "<img src="ubb/2.gif" />", $str);

//表情UBB U禁止贪婪匹配，只跟踪到最近的一个匹配符并结束。

$str = preg_replace("/[em_(.*)]/iU","<img src="ubb/1.gif" />",$str);

//加粗UBB

$str = preg_replace("/[b](.*)[/b]/i","<b>1</b>",$str);

//链接UBB

$str = preg_replace("/([url])(.*)([/url])/i", "<a href=2 target="new">2</a>", $str);

//QQ号码UBB

$str = preg_replace("/[qq]([0-9]*)[/qq]/i", "<a target="_blank" href="tencent://message/?uin=${1}&amp;site=www.php100.com&amp;menu=yes"><img src="http://wpa.qq.com/pa?p=1:${1}:8" alt="QQ${1}" height="16" border="0" align="top" /></a>", $str);

return $str;

}

if($_POST['sub']){

echo get_ubb($_POST[message]);

}

?>

<script>

function inserttag(topen,tclose){

var themess = document.getElementByIdx_x('con');//编辑对象

themess.focus();

if (document.selection) {//如果是否ie浏览器

var theSelection = document.selection.createRange().text;//获取选区文字

//alert(theSelection);

if(theSelection){

document.selection.createRange().text = theSelection = topen+theSelection+tclose;//替换

}else{

document.selection.createRange().text = topen+tclose;
}

theSelection='';

}else{//其他浏览器

var scrollPos = themess.scrollTop;

var selLength = themess.textLength;

var selStart = themess.selectionStart;//选区起始点索引，未选择为0

var selEnd = themess.selectionEnd;//选区终点点索引

if (selEnd <= 2)

selEnd = selLength;

var s1 = (themess.value).substring(0,selStart);//截取起始点前部分字符

var s2 = (themess.value).substring(selStart, selEnd)//截取选择部分字符

var s3 = (themess.value).substring(selEnd, selLength);//截取终点后部分字符

themess.value = s1 + topen + s2 + tclose + s3;//替换

themess.focus();

themess.selectionStart = newStart;

themess.selectionEnd = newStart;

themess.scrollTop = scrollPos;

return;

}

}

</script>

<hr/>

<font size=2>

<img src="ubb/bizui.gif" onclick='inserttag("[em_bizui","]");' />

<img src="ubb/chiya.gif" onclick='inserttag("[em_chiya","]");' />

<img src="ubb/diaopi.gif" onclick='inserttag("[em_diaopi","]");' />

<img src="ubb/ku.gif" onclick='inserttag("[em_ku","]");' />

<img src="ubb/liuhan.gif" onclick='inserttag("[em_liuhan","]");' />

<img src="ubb/liulei.gif" onclick='inserttag("[em_liulei","]");' />

<img src="ubb/se.gif" onclick='inserttag("[em_se","]");' />

<img src="ubb/touxiao.gif" onclick='inserttag("[em_touxiao","]");' />

<img src="ubb/weixiao.gif" onclick='inserttag("[em_weixiao","]");' />

<img src="ubb/yun.gif" onclick='inserttag("[em_yun","]");' />
<a href="javascript：void(0);" onclick='inserttag("[b]","[/b]");'>加粗</a>

<a href="javascript：void(0);" onclick='inserttag("[qq]","[/qq]");'>QQ号</a>

<a href="javascript：void(0);" onclick='inserttag("[url]","[/url]");'>超链接</a>

<br>

<form action="" method="post">

<textarea name="message" id="con" cols="70%" rows="10"></textarea>

<input type="submit" name="sub" value="提交"/>

</form>

图片所在的位置

ubb文件夹下面