PHP常用函数1.产生随机字符串函数
PHP常用函数2.截取一定长度的字符串
注：该函数对gb2312使用有效
<ol class="dp-xml">
<li class="alt"><span><span>function wordscut($string, $length ,$</span><span class="attribute">sss</span><span>=</span><span class="attribute-value">0</span><span>) { </span></span></li>
<li>
<span>if(strlen($string) </span><span class="tag">></span><span> $length) { </span>
</li>
<li class="alt"><span>if($sss){ </span></li>
<li>
<span>$</span><span class="attribute">length</span><span>=$length - 3; </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">addstr</span><span>=@# ...@#; </span>
</li>
<li><span>} </span></li>
<li class="alt">
<span>for($</span><span class="attribute">i</span><span> = </span><span class="attribute-value">0</span><span>; $i </span><span class="tag"><span> $length; $i++) { </span></span>
</li>
<li>
<span>if(ord($string[$i]) </span><span class="tag">></span><span> 127) { </span>
</li>
<li class="alt">
<span>$wordscut </span><span class="attribute">.</span><span>= $string[$i].$string[$i + 1]; </span>
</li>
<li><span>$i++; </span></li>
<li class="alt"><span>} else { </span></li>
<li>
<span>$wordscut </span><span class="attribute">.</span><span>= $string[$i]; </span>
</li>
<li class="alt"><span>} </span></li>
<li><span>} </span></li>
<li class="alt"><span>return $wordscut.$addstr; </span></li>
<li><span>} </span></li>
<li class="alt"><span>return $string; </span></li>
<li><span>} </span></li>
</ol>PHP常用函数3.取得客户端ip地址
<ol class="dp-xml">
<li class="alt"><span><span>function getip(){ </span></span></li>
<li><span>if (getenv("http_client_ip") <br>&& strcasecmp(getenv("http_client_ip"), "unknown")) </span></li>
<li class="alt">
<span>$</span><span class="attribute">ip</span><span> = </span><span class="attribute-value">getenv</span><span>("http_client_ip"); </span>
</li>
<li><span>else if (getenv("http_x_forwarded_for") <br>&& strcasecmp(getenv("http_x_forwarded_for"), "unknown")) </span></li>
<li class="alt">
<span>$</span><span class="attribute">ip</span><span> = </span><span class="attribute-value">getenv</span><span>("http_x_forwarded_for"); </span>
</li>
<li><span>else if (getenv("remote_addr")<br> && strcasecmp(getenv("remote_addr"), "unknown")) </span></li>
<li class="alt">
<span>$</span><span class="attribute">ip</span><span> = </span><span class="attribute-value">getenv</span><span>("remote_addr"); </span>
</li>
<li><span>else if (isset($_server[@#remote_addr@#])<br> && $_server[@#remote_addr@#] <br>&& strcasecmp($_server[@#remote_addr@#], "unknown")) </span></li>
<li class="alt">
<span>$</span><span class="attribute">ip</span><span> = $_server[@#remote_addr@#]; </span>
</li>
<li><span>else </span></li>
<li class="alt">
<span>$</span><span class="attribute">ip</span><span> = </span><span class="attribute-value">"unknown"</span><span>; </span>
</li>
<li><span>return($ip); </span></li>
<li class="alt"><span>} </span></li>
</ol>PHP常用函数4.创建相应的文件夹
<ol class="dp-xml">
<li class="alt"><span><span>function createdir($</span><span class="attribute">dir</span><span>=@#@#) </span></span></li>
<li><span>{ </span></li>
<li class="alt"><span>if (!is_dir($dir)) </span></li>
<li><span>{ </span></li>
<li class="alt">
<span>$</span><span class="attribute">temp</span><span> = </span><span class="attribute-value">explode</span><span>(@#/@#,$dir); </span>
</li>
<li>
<span>$</span><span class="attribute">cur_dir</span><span> = @#@#; </span>
</li>
<li class="alt">
<span>for($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">count</span><span>($temp);$i++) </span></span>
</li>
<li><span>{ </span></li>
<li class="alt">
<span>$cur_dir </span><span class="attribute">.</span><span>= $temp[$i].@#/@#; </span>
</li>
<li><span>if (!is_dir($cur_dir)) </span></li>
<li class="alt"><span>{ </span></li>
<li><span>@mkdir($cur_dir,0777); </span></li>
<li class="alt"><span>} </span></li>
<li><span>} </span></li>
</ol>
