编写smarty的ubb插件实现彩字
<p><P>最近流行彩字,下面是简单的实现<a href="http://www.phpchina.com/javascript:;" onClick="javascript:tagshow(event, '%B7%BD%B7%A8');" target="_self"><u><strong>方法</strong></u></a>:</P><P>一.彩字的简单实现</P><P><TABLE style="BORDER-RIGHT: #999 1px solid; BORDER-TOP: #999 1px solid; FONT-SIZE: 12px; BORDER-LEFT: #999 1px solid; WIDTH: 80%; BORDER-BOTTOM: #999 1px solid" align=center><TBODY><TR><TD><FONT face=新宋体><FONT color=#0000bb>header</FONT><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #dd0000">"Content-type: image/png"</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">);<BR></SPAN><SPAN style="COLOR: #0000bb">$text </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">$_GET</SPAN><SPAN style="COLOR: #007700">[</SPAN><SPAN style="COLOR: #dd0000">'t'</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">];<BR></SPAN><SPAN style="COLOR: #0000bb">$font </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #dd0000">'STXINGKA.TTF'</SPAN><SPAN style="COLOR: #007700">; </SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #ff8000">//TTF字体<BR></SPAN><SPAN style="COLOR: #0000bb">$fontsize </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">30</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">;<BR></SPAN><SPAN style="COLOR: #0000bb">$size </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">imagettfbbox</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$fontsize</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">0</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">$font</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">$text</SPAN><SPAN style="COLOR: #007700">); </SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #ff8000">//获得字体长宽范围<BR></SPAN><SPAN style="COLOR: #0000bb">$dx </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">abs</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$size</SPAN><SPAN style="COLOR: #007700">[</SPAN><SPAN style="COLOR: #0000bb">2</SPAN><SPAN style="COLOR: #007700">]-</SPAN><SPAN style="COLOR: #0000bb">$size</SPAN><SPAN style="COLOR: #007700">[</SPAN><SPAN style="COLOR: #0000bb">0</SPAN><SPAN style="COLOR: #007700">]) +</SPAN><SPAN style="COLOR: #0000bb">10</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">;<BR></SPAN><SPAN style="COLOR: #0000bb">$dy </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">abs</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$size</SPAN><SPAN style="COLOR: #007700">[</SPAN><SPAN style="COLOR: #0000bb">5</SPAN><SPAN style="COLOR: #007700">]-</SPAN><SPAN style="COLOR: #0000bb">$size</SPAN><SPAN style="COLOR: #007700">[</SPAN><SPAN style="COLOR: #0000bb">3</SPAN></FONT><SPAN style="COLOR: #007700"><FONT face=新宋体>]);<BR></FONT></SPAN><FONT face=新宋体><SPAN style="COLOR: #ff8000">//构建图像<BR></SPAN><SPAN style="COLOR: #0000bb">$im </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">imagecreate</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$dx</SPAN><SPAN style="COLOR: #007700">,</SPAN><SPAN style="COLOR: #0000bb">$dy</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">);<BR></SPAN><SPAN style="COLOR: #0000bb">imagecolorallocate</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$im</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">255</SPAN><SPAN style="COLOR: #007700">,</SPAN><SPAN style="COLOR: #0000bb">255</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">255</SPAN><SPAN style="COLOR: #007700">); </SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #ff8000">//背景色<BR></SPAN><SPAN style="COLOR: #0000bb">$fontcolor </SPAN><SPAN style="COLOR: #007700">= </SPAN><SPAN style="COLOR: #0000bb">imagecolorallocate</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$im</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">255</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">0</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">0</SPAN><SPAN style="COLOR: #007700">); </SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #ff8000">//字体颜色<BR></SPAN><SPAN style="COLOR: #0000bb">ImageTTFText</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$im</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">$fontsize</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">0</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">0</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">abs</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$size</SPAN><SPAN style="COLOR: #007700">[</SPAN><SPAN style="COLOR: #0000bb">5</SPAN><SPAN style="COLOR: #007700">]), </SPAN><SPAN style="COLOR: #0000bb">$fontcolor</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">$font</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #0000bb">$text</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">);<BR></SPAN><SPAN style="COLOR: #0000bb">imagepng</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$im</SPAN></FONT><FONT face=新宋体><SPAN style="COLOR: #007700">);<BR></SPAN><SPAN style="COLOR: #0000bb">imagedestroy</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$im</SPAN><SPAN style="COLOR: #007700">);</SPAN></FONT></TD></TR></TBODY></TABLE><BR>上面的程序只是表述了一些彩字的基本原理,要实现更复杂和美观的彩字,所要做的只是更换一下字体,改一下字体颜色,添加一些背景图,再考虑一下缓存等,方法也差不多,朋友们可以自己试试.</P><P>二.彩字应用</P><P>上面的程序生成的彩字是通过"?t=文字"来传递的,但需注意的是,这些文字最好用urlencode来编码,当然,长度也应该有限制,这不是本文讨论的范围.<BR>另外,生成彩字的程序和传递文字的程序都使用UTF-8编码,如果不是,手工转一下..<BR>要使用彩字,只需要用<img src="http://www.phpchina.com/color.php?t=xxx" />即可,其中,color.php为生成彩字的程序(即上面的程序),xxx为经urlencode编码的文字(用来生成彩字)</P><P>三.smarty插件</P><P>在<a href="http://www.phpchina.com/javascript:;" onClick="javascript:tagshow(event, 'smarty');" target="_self"><u><strong>smarty</strong></u></a>的plugins目录下新建一文件modifier.ubb.php,内容如下:</P><P><TABLE style="BORDER-RIGHT: #999 1px solid; BORDER-TOP: #999 1px solid; FONT-SIZE: 12px; BORDER-LEFT: #999 1px solid; WIDTH: 80%; BORDER-BOTTOM: #999 1px solid" align=center><TBODY><TR><TD><FONT face=新宋体><SPAN style="COLOR: #007700"><SPAN style="COLOR: #007700">function </SPAN><SPAN style="COLOR: #0000bb">smarty_modifier_ubb</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$string</SPAN><SPAN style="COLOR: #007700">){<BR> </SPAN><SPAN style="COLOR: #0000bb">$ubb </SPAN><SPAN style="COLOR: #007700">= array(<BR> </SPAN><SPAN style="COLOR: #dd0000">'/\[b\](.+?)\[\/b\]/i'</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #ff8000">#加粗<BR> </SPAN><SPAN style="COLOR: #dd0000">'/\[url=(.+?)\](.+?)\[\/url\]/i'</SPAN><SPAN style="COLOR: #007700">, </SPAN><SPAN style="COLOR: #ff8000">#url<BR> </SPAN><SPAN style="COLOR: #dd0000">'/\[colorFont\](.+?)\[\/colorFont\]/ie' </SPAN><SPAN style="COLOR: #ff8000">#彩字,注意,要加e修饰符<BR> </SPAN><SPAN style="COLOR: #007700">);<BR> </SPAN><SPAN style="COLOR: #0000bb">$toHtml </SPAN><SPAN style="COLOR: #007700">= array(<BR> </SPAN><SPAN style="COLOR: #dd0000">'<b>\\1</b>'</SPAN><SPAN style="COLOR: #007700">,<BR> </SPAN><SPAN style="COLOR: #dd0000">'<a href="http://www.phpchina.com/\\1">\\2</a>'</SPAN><SPAN style="COLOR: #007700">,<BR> </SPAN><SPAN style="COLOR: #dd0000">'"<img src=http://www.phpchina.com/\'color.php?t=".urlencode("\\1")."\'/>"'<BR> </SPAN><SPAN style="COLOR: #007700">);<BR> </SPAN><SPAN style="COLOR: #ff8000">//以上只是演UBB的实现,更多的UBB标签朋友们可以按方法自己实现,其中的color.php根椐实际去修改<BR> </SPAN><SPAN style="COLOR: #007700">return </SPAN><SPAN style="COLOR: #0000bb">preg_replace</SPAN><SPAN style="COLOR: #007700">(</SPAN><SPAN style="COLOR: #0000bb">$ubb</SPAN><SPAN style="COLOR: #007700">,</SPAN><SPAN style="COLOR: #0000bb">$toHtml</SPAN><SPAN style="COLOR: #007700">,</SPAN><SPAN style="COLOR: #0000bb">$string</SPAN><SPAN style="COLOR: #007700">);<BR>}</SPAN></SPAN></FONT></TD></TR></TBODY></TABLE></P><P>这样,要显示彩字,只需在内容中加入<BR>[colorFont]文字[/colorFont]<BR>显示时,在smarty模板中使用ubb修饰符即可,如{$content|ubb}</P></p> <center><input type="image" onclick=copyToClipBoard() src="http://www.phpchina.com/images/phpcn_book_bu_tj.gif" border="0"></center>
