PHP截取字符串乱码问题彻底解决
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好了，不发牢骚了，分享一个PHP截取字符串无乱码的函数，其实，这是UCHOME里的函数，只是稍微做了一下修改而已，有人说mb_substr()也可以，不是我信不过，当然可以，只是在mb_substr()是按字符来截的，不是按字节，OK 下面上代码：
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<span style="color: #000000;font-weight: bold">function</span> cutstr<span style="color: #009900">(</span><span style="color: #000088">$string</span><span style="color: #339933">,</span> <span style="color: #000088">$length</span><span style="color: #339933">,</span><span style="color: #000088">$charset</span><span style="color: #339933">,</span><span style="color: #000088">$dot</span><span style="color: #009900">)</span> <span style="color: #009900">{</span><span style="color: #666666;font-style: italic">//字符，截取长度，字符集，结尾符</span>
<span style="color: #b1b100">if</span><span style="color: #009900">(</span><a rel="noopener noreferrer nofollow" href="http://www.php.net/strlen" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">strlen</span></a><span style="color: #009900">(</span><span style="color: #000088">$string</span><span style="color: #009900">)</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #000088">$length</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #b1b100">return</span> <span style="color: #000088">$string</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span>
<span style="color: #000088">$pre</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/chr" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">chr</span></a><span style="color: #009900">(</span><span style="color: #cc66cc">1</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #000088">$end</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/chr" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">chr</span></a><span style="color: #009900">(</span><span style="color: #cc66cc">1</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #666666;font-style: italic">//保护特殊字符串</span>
<span style="color: #000088">$string</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/str_replace" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">str_replace</span></a><span style="color: #009900">(</span><a rel="noopener noreferrer nofollow" href="http://www.php.net/array" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">array</span></a><span style="color: #009900">(</span><span style="color: #0000ff">'&'</span><span style="color: #339933">,</span> <span style="color: #0000ff">'"'</span><span style="color: #339933">,</span> <span style="color: #0000ff">'<'</span><span style="color: #339933">,</span> <span style="color: #0000ff">'>'</span><span style="color: #009900">)</span><span style="color: #339933">,</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/array" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">array</span></a><span style="color: #009900">(</span><span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'&'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #339933">,</span> <span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'"'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #339933">,</span> <span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'<'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #339933">,</span> <span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'>'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #009900">)</span><span style="color: #339933">,</span> <span style="color: #000088">$string</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #000088">$strcut</span> <span style="color: #339933">=</span> <span style="color: #0000ff">''</span><span style="color: #339933">;</span>
<span style="color: #b1b100">if</span><span style="color: #009900">(</span><a rel="noopener noreferrer nofollow" href="http://www.php.net/strtolower" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">strtolower</span></a><span style="color: #009900">(</span><span style="color: #000088">$charset</span><span style="color: #009900">)</span> <span style="color: #339933">==</span> <span style="color: #0000ff">'utf-8'</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$n</span> <span style="color: #339933">=</span> <span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #000088">$noc</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">0</span><span style="color: #339933">;</span>
<span style="color: #b1b100">while</span><span style="color: #009900">(</span><span style="color: #000088">$n</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/strlen" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">strlen</span></a><span style="color: #009900">(</span><span style="color: #000088">$string</span><span style="color: #009900">)</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$t</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/ord" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">ord</span></a><span style="color: #009900">(</span><span style="color: #000088">$string</span><span style="color: #009900">[</span><span style="color: #000088">$n</span><span style="color: #009900">]</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #b1b100">if</span><span style="color: #009900">(</span><span style="color: #000088">$t</span> <span style="color: #339933">==</span> <span style="color: #cc66cc">9</span> <span style="color: #339933">||</span> <span style="color: #000088">$t</span> <span style="color: #339933">==</span> <span style="color: #cc66cc">10</span> <span style="color: #339933">||</span> <span style="color: #009900">(</span><span style="color: #cc66cc">32</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>amp<span style="color: #339933">;&</span>amp<span style="color: #339933">;</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #cc66cc">126</span><span style="color: #009900">)</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">1</span><span style="color: #339933">;</span> <span style="color: #000088">$n</span><span style="color: #339933">++;</span> <span style="color: #000088">$noc</span><span style="color: #339933">++;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">elseif</span><span style="color: #009900">(</span><span style="color: #cc66cc">194</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>amp<span style="color: #339933">;&</span>amp<span style="color: #339933">;</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #cc66cc">223</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span> <span style="color: #000088">$n</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span> <span style="color: #000088">$noc</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">elseif</span><span style="color: #009900">(</span><span style="color: #cc66cc">224</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>amp<span style="color: #339933">;&</span>amp<span style="color: #339933">;</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #cc66cc">239</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">3</span><span style="color: #339933">;</span> <span style="color: #000088">$n</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">3</span><span style="color: #339933">;</span> <span style="color: #000088">$noc</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">elseif</span><span style="color: #009900">(</span><span style="color: #cc66cc">240</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>amp<span style="color: #339933">;&</span>amp<span style="color: #339933">;</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #cc66cc">247</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">4</span><span style="color: #339933">;</span> <span style="color: #000088">$n</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">4</span><span style="color: #339933">;</span> <span style="color: #000088">$noc</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">elseif</span><span style="color: #009900">(</span><span style="color: #cc66cc">248</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>amp<span style="color: #339933">;&</span>amp<span style="color: #339933">;</span> <span style="color: #000088">$t</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;=</span> <span style="color: #cc66cc">251</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">5</span><span style="color: #339933">;</span> <span style="color: #000088">$n</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">5</span><span style="color: #339933">;</span> <span style="color: #000088">$noc</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">elseif</span><span style="color: #009900">(</span><span style="color: #000088">$t</span> <span style="color: #339933">==</span> <span style="color: #cc66cc">252</span> <span style="color: #339933">||</span> <span style="color: #000088">$t</span> <span style="color: #339933">==</span> <span style="color: #cc66cc">253</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$tn</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">6</span><span style="color: #339933">;</span> <span style="color: #000088">$n</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">6</span><span style="color: #339933">;</span> <span style="color: #000088">$noc</span> <span style="color: #339933">+=</span> <span style="color: #cc66cc">2</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">else</span> <span style="color: #009900">{</span>
<span style="color: #000088">$n</span><span style="color: #339933">++;</span>
<span style="color: #009900">}</span>
<span style="color: #b1b100">if</span><span style="color: #009900">(</span><span style="color: #000088">$noc</span> <span style="color: #339933">&</span>gt<span style="color: #339933">;=</span> <span style="color: #000088">$length</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #b1b100">break</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span>
<span style="color: #009900">}</span>
<span style="color: #b1b100">if</span><span style="color: #009900">(</span><span style="color: #000088">$noc</span> <span style="color: #339933">&</span>gt<span style="color: #339933">;</span> <span style="color: #000088">$length</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$n</span> <span style="color: #339933">-=</span> <span style="color: #000088">$tn</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span>
<span style="color: #000088">$strcut</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/substr" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">substr</span></a><span style="color: #009900">(</span><span style="color: #000088">$string</span><span style="color: #339933">,</span> <span style="color: #cc66cc">0</span><span style="color: #339933">,</span> <span style="color: #000088">$n</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span> <span style="color: #b1b100">else</span> <span style="color: #009900">{</span>
<span style="color: #b1b100">for</span><span style="color: #009900">(</span><span style="color: #000088">$i</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">0</span><span style="color: #339933">;</span> <span style="color: #000088">$i</span> <span style="color: #339933">&</span>lt<span style="color: #339933">;</span> <span style="color: #000088">$length</span><span style="color: #339933">;</span> <span style="color: #000088">$i</span><span style="color: #339933">++</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$strcut</span> <span style="color: #339933">.=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/ord" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">ord</span></a><span style="color: #009900">(</span><span style="color: #000088">$string</span><span style="color: #009900">[</span><span style="color: #000088">$i</span><span style="color: #009900">]</span><span style="color: #009900">)</span> <span style="color: #339933">&</span>gt<span style="color: #339933">;</span> <span style="color: #cc66cc">127</span> ? <span style="color: #000088">$string</span><span style="color: #009900">[</span><span style="color: #000088">$i</span><span style="color: #009900">]</span><span style="color: #339933">.</span><span style="color: #000088">$string</span><span style="color: #009900">[</span><span style="color: #339933">++</span><span style="color: #000088">$i</span><span style="color: #009900">]</span> <span style="color: #339933">:</span> <span style="color: #000088">$string</span><span style="color: #009900">[</span><span style="color: #000088">$i</span><span style="color: #009900">]</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span>
<span style="color: #009900">}</span>
<span style="color: #666666;font-style: italic">//还原特殊字符串</span>
<span style="color: #000088">$strcut</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/str_replace" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">str_replace</span></a><span style="color: #009900">(</span><a rel="noopener noreferrer nofollow" href="http://www.php.net/array" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">array</span></a><span style="color: #009900">(</span><span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'&'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #339933">,</span> <span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'"'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #339933">,</span> <span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'<'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #339933">,</span> <span style="color: #000088">$pre</span><span style="color: #339933">.</span><span style="color: #0000ff">'>'</span><span style="color: #339933">.</span><span style="color: #000088">$end</span><span style="color: #009900">)</span><span style="color: #339933">,</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/array" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">array</span></a><span style="color: #009900">(</span><span style="color: #0000ff">'&'</span><span style="color: #339933">,</span> <span style="color: #0000ff">'"'</span><span style="color: #339933">,</span> <span style="color: #0000ff">'<'</span><span style="color: #339933">,</span> <span style="color: #0000ff">'>'</span><span style="color: #009900">)</span><span style="color: #339933">,</span> <span style="color: #000088">$strcut</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #666666;font-style: italic">//修复出现特殊字符串截段的问题</span>
<span style="color: #000088">$pos</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/strrpos" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">strrpos</span></a><span style="color: #009900">(</span><span style="color: #000088">$s</span><span style="color: #339933">,</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/chr" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">chr</span></a><span style="color: #009900">(</span><span style="color: #cc66cc">1</span><span style="color: #009900">)</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #b1b100">if</span><span style="color: #009900">(</span><span style="color: #000088">$pos</span> <span style="color: #339933">!==</span> <span style="color: #009900;font-weight: bold">false</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
<span style="color: #000088">$strcut</span> <span style="color: #339933">=</span> <a rel="noopener noreferrer nofollow" href="http://www.php.net/substr" rel="noopener noreferrer nofollow" target="_blank"><span style="color: #990000">substr</span></a><span style="color: #009900">(</span><span style="color: #000088">$s</span><span style="color: #339933">,</span><span style="color: #cc66cc">0</span><span style="color: #339933">,</span><span style="color: #000088">$pos</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span>
<span style="color: #b1b100">return</span> <span style="color: #000088">$strcut</span><span style="color: #339933">.</span><span style="color: #000088">$dot</span><span style="color: #339933">;</span>
<span style="color: #009900">}</span>
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