分享下在PHP中过滤ascii控制字符的方法。
将爬来的其它网站的数据导到xml，问题：即网页会有ascII的控制字符。
一开始以为是别人为了防止采集而加入的，然后发现一个就往过滤表里加一个。直到慢慢发现，他们都是ascii表里的字符。
解决方法：
<span>/*</span><span>*
* 根据ascii码过滤控制字符
* @param type $string
</span><span>*/</span>
<span>public</span> <span>static</span> <span>function</span> special_filter(<span>$string</span><span>)
{
</span><span>if</span>(!<span>$string</span>) <span>return</span> ''<span>;
</span><span>$new_string</span> = ''<span>;
</span><span>for</span>(<span>$i</span> =0; <span>isset</span>(<span>$string</span>[<span>$i</span>]); <span>$i</span>++<span>)
{
</span><span>$asc_code</span> = <span>ord</span>(<span>$string</span>[<span>$i</span>]); <span>//</span><span>得到其asc码</span>
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</span><span>//</span><span>以下代码旨在过滤非法字符 </span>
<span>if</span>(<span>$asc_code</span> == 9 || <span>$asc_code</span> == 10 || <span>$asc_code</span> == 13<span>){
</span><span>$new_string</span> .= ' '<span>;
}
</span><span>else</span> <span>if</span>(<span>$asc_code</span> > 31 && <span>$asc_code</span> != 127<span>){
</span><span>$new_string</span> .= <span>$string</span>[<span>$i</span><span>];
}
}
</span><span>return</span> <span>trim</span>(<span>$new_string</span><span>);
}</span>
