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<h2 id="1-交换两个变量的值。"><a href="#1-交换两个变量的值。" class="headerlink" title="1.交换两个变量的值。 "></a>1.交换两个变量的值。 </h2><p>分析：常用的做法是添加第三个变量来作为中介完成，这里分享一个不太常用的做法：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">变量为字符串时：</span><br><span class="line">$a = "hello";</span><br><span class="line">$b = "php";</span><br><span class="line">list($a,$b) = array($b,$a);</span><br><span class="line">或者：</span><br><span class="line">$a = $a.$b;</span><br><span class="line">$b = strlen($a);</span><br><span class="line">$b = substr($a,0,(strlen($a)-$b));</span><br><span class="line">$a = substr($a,strlen($b));</span><br><span class="line"></span><br><span class="line">变量值为数字时：</span><br><span class="line">$a=$a+$b; </span><br><span class="line">$b=$a-$b;</span><br><span class="line">$a=$a-$b;</span><br></pre></td></tr></table></figure>
<p>可以取a=4,b=5代入，进行验证。</p>
<p>对上述两种情况有一个通用的方法：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">$a = array($a,$b);</span><br><span class="line">$b = $a[0];</span><br><span class="line">$a = $a[1];</span><br></pre></td></tr></table></figure>
<h2 id="2-不使用php内置方法获取到一个字符串的长度"><a href="#2-不使用php内置方法获取到一个字符串的长度" class="headerlink" title="2.不使用php内置方法获取到一个字符串的长度"></a>2.不使用php内置方法获取到一个字符串的长度</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">$str = "hello php";</span><br><span class="line">for($length=0;true;$length++) {</span><br><span class="line"> if(!isset($str[$length])) {</span><br><span class="line"> break;</span><br><span class="line"> }</span><br><span class="line">} </span><br><span class="line">echo $length;//输出$str的长度：9</span><br></pre></td></tr></table></figure>
<h2 id="3-利用php内置函数完成多级目录的递归创建"><a href="#3-利用php内置函数完成多级目录的递归创建" class="headerlink" title="3.利用php内置函数完成多级目录的递归创建"></a>3.利用php内置函数完成多级目录的递归创建</h2><p>分析：由于老版本(version<5.0)的mkdir函数不能够递归创建目录，因此需要找到新的解决方案。<br>方法1：<br> 喜大普奔，新版本的mkdir已经可以递归创建目录了（^_^）,只需要将第三个参数设置为true即可。<br>方法2：<br> 那么对于旧版本该如何创建呢？下面给出解决代码(十分精简的递归代码)</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><?php</span><br><span class="line">$path = 'D:/QQ/files/temp/tests';</span><br><span class="line">function recursive($path) </span><br><span class="line">{</span><br><span class="line"> if(is_dir($path)){</span><br><span class="line"> return true;</span><br><span class="line"> }else {</span><br><span class="line"> recursive(dirname($path));</span><br><span class="line"> mkdir($path);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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