如何运用PHP转义符解决代码转换问题

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<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"><?</FONT></STRONG></SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN>//--标题,名字等字段入库处理(去首尾空格)  </SPAN><LI class=alt><SPAN>function trans_string_trim($str) {  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>str</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>trim</FONT></SPAN><SPAN>($str);  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>str</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>eregi_replace</FONT></SPAN><SPAN>("'","''",$str);  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>str</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>stripslashes</FONT></SPAN><SPAN>($str);  </SPAN></SPAN><LI class=alt><SPAN>return $str;  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>//--文章入库处理，即textarea字段；  </SPAN><LI class=alt><SPAN>function trans_string($str) {  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>str</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>eregi_replace</FONT></SPAN><SPAN>("'","''",$str);  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>str</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>stripslashes</FONT></SPAN><SPAN>($str);  </SPAN></SPAN><LI class=""><SPAN>return $str;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>//--从库中显示在表单中；在text中以trans转换,在textarea中,无需转换,直接显示  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>//--显示在WEB页面，过滤HTML代码；包括链接地址  </SPAN><LI class=""><SPAN>function trans($string) {  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>string</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>htmlspecialchars</FONT></SPAN><SPAN>($string);  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>string</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>ereg_replace</FONT></SPAN><SPAN>(chr(10),"</SPAN><STRONG><FONT color=#006699><SPAN class=tag><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></font></strong></span><span>",$string);  </span></span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(32)," ",$string);  </span>
</li>
<li class=""><span>return $string;  </span></li>
<li class="alt"><span>}  </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>//--显示在WEB页面，不过滤HTML代码；  </span></li>
<li class=""><span>function trans_web($string) {  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(10),"</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span>",$string);  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(32)," ",$string);  </span>
</li>
<li class="alt"><span>return $string;  </span></li>
<li class=""><span>}  </span></li>
<li class="alt"><span> </span></li>
<li class=""><span>//--显示在WEB页面，过滤HTML代码及头尾空格,主要用于显示用户昵称  </span></li>
<li class="alt"><span>function trans_trim($string) {  </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">trim</font></span><span>($string);  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">htmlspecialchars</font></span><span>($string);  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(10),"</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span>",$string);  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(32)," ",$string);  </span>
</li>
<li class=""><span>return $string;  </span></li>
<li class="alt"><span>}  </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>//--显示在span中；  </span></li>
<li class=""><span>function trans_span($string) {  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(10),"n",$string);  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>(chr(32)," ",$string);  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">string</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">ereg_replace</font></span><span>('"',""",$string);  </span>
</li>
<li class=""><span>return $string;  </span></li>
<li class="alt"><span>}  </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>//--在WEB上显示cookie,过滤html  </span></li>
<li class=""><span>function trans_cookie($str) {  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">str</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">trans</font></span><span>($str);  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">str</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">stripslashes</font></span><span>($str);  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">str</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">eregi_replace</font></span><span>("''","'",$str);  </span>
</li>
<li class=""><span>return $str;  </span></li>
<li class="alt"><span>}  </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>

最后，关于PHP转义符的用法再顺带补充一点，假如在span中显示文章中的一段，采用substr取定长字符串时，记得在span的参数后面多加一个空格，否则遇上截到半个汉字时，会搞乱html代码。

以上就是我们为大家奉上的关于PHP转义符解决代码转换问题的办法。