在面试中我们经常遇到这个题目:php遍历一个文件夹下的所有文件和子文件夹。
这个题目有好多种解决方法。但大致思路都一样。采用递归。
<ol class="dp-c"> <li class="alt"><span><span> </span><span class="vars">$path</span><span> = </span><span class="string">./filepath</span><span>; </span></span></li> <li> <span> </span><span class="keyword">function</span><span> getfiles(</span><span class="vars">$path</span><span>) </span> </li> <li class="alt"><span> { </span></li> <li> <span> </span><span class="keyword">if</span><span>(!</span><span class="func">is_dir</span><span>(</span><span class="vars">$path</span><span>)) </span><span class="keyword">return</span><span>; </span> </li> <li class="alt"> <span> </span><span class="vars">$handle</span><span> = opendir(</span><span class="vars">$path</span><span>); </span> </li> <li> <span> </span><span class="keyword">while</span><span>( false !== (</span><span class="vars">$file</span><span> = readdir(</span><span class="vars">$handle</span><span>))) </span> </li> <li class="alt"><span> { </span></li> <li> <span> </span><span class="keyword">if</span><span>(</span><span class="vars">$file</span><span> != </span><span class="string">.</span><span> && </span><span class="vars">$file</span><span>!=</span><span class="string">..</span><span>) </span> </li> <li class="alt"><span> { </span></li> <li> <span> </span><span class="vars">$path2</span><span>= </span><span class="vars">$path</span><span>.</span><span class="string">/</span><span>.</span><span class="vars">$file</span><span>; </span> </li> <li class="alt"> <span> </span><span class="keyword">if</span><span>(</span><span class="func">is_dir</span><span>(</span><span class="vars">$path2</span><span>)) </span> </li> <li><span> { </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span> </li> <li><span>; </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span><span class="vars">$file</span><span>; </span> </li> <li> <span> getfiles(</span><span class="vars">$path2</span><span>); </span> </li> <li class="alt"> <span> }</span><span class="keyword">else</span><span> </span> </li> <li><span> { </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span> </li> <li><span>; </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span><span class="vars">$file</span><span>; </span> </li> <li><span> } </span></li> <li class="alt"><span> } </span></li> <li><span> } </span></li> <li class="alt"><span>} </span></li> <li><span> </span></li> <li class="alt"> <span> print_r( getfiles(</span><span class="vars">$path</span><span>)); </span> </li> <li><span> </span></li> <li class="alt"> <span class="func">echo</span><span> </span> </li> <li><span><hr>; </span></li> <li class="alt"><span> </span></li> <li> <span class="keyword">function</span><span> getdir(</span><span class="vars">$path</span><span>) </span> </li> <li class="alt"><span>{ </span></li> <li> <span> </span><span class="keyword">if</span><span>(!</span><span class="func">is_dir</span><span>(</span><span class="vars">$path</span><span>)) </span><span class="keyword">return</span><span>; </span> </li> <li class="alt"> <span> </span><span class="vars">$handle</span><span> = dir(</span><span class="vars">$path</span><span>); </span> </li> <li> <span> </span><span class="keyword">while</span><span>(</span><span class="vars">$file</span><span>=</span><span class="vars">$handle</span><span>->read()) </span> </li> <li class="alt"><span> { </span></li> <li> <span> </span><span class="keyword">if</span><span>(</span><span class="vars">$file</span><span>!=</span><span class="string">.</span><span> && </span><span class="vars">$file</span><span>!=</span><span class="string">..</span><span>) </span> </li> <li class="alt"><span> { </span></li> <li> <span> </span><span class="vars">$path2</span><span> = </span><span class="vars">$path</span><span>.</span><span class="string">/</span><span>.</span><span class="vars">$file</span><span>; </span> </li> <li class="alt"> <span> </span><span class="keyword">if</span><span>(</span><span class="func">is_dir</span><span>(</span><span class="vars">$path2</span><span>)) </span> </li> <li><span> { </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span><span class="vars">$file</span><span>.</span><span class="string">" "</span><span>; </span> </li> <li> <span> getdir(</span><span class="vars">$path2</span><span>); </span> </li> <li class="alt"> <span> }</span><span class="keyword">else</span><span> </span> </li> <li><span> { </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span><span class="vars">$file</span><span>. </span> </li> <li><span>; </span></li> <li class="alt"><span> } </span></li> <li><span> } </span></li> <li class="alt"><span> } </span></li> <li><span>} </span></li> <li class="alt"> <span> getdir(</span><span class="vars">$path</span><span>); </span> </li> <li><span> </span></li> <li class="alt"> <span> </span><span class="func">echo</span><span> </span> </li> <li><span><hr>; </span></li> <li class="alt"><span> </span></li> <li> <span> </span><span class="keyword">function</span><span> get_dir_scandir(</span><span class="</p"> <p align="left"></p> <div style="display:none;"> <span id="url" itemprop="url">http://www.bkjia.com/PHPjc/486278.html</span><span id="indexUrl" itemprop="indexUrl">www.bkjia.com</span><span id="isOriginal" itemprop="isOriginal">true</span><span id="isBasedOnUrl" itemprop="isBasedOnUrl">http://www.bkjia.com/PHPjc/486278.html</span><span id="genre" itemprop="genre">TechArticle</span><span id="description" itemprop="description">在面试中我们经常遇到这个题目:php遍历一个文件夹下的所有文件和子文件夹。 这个题目有好多种解决方法。但大致思路都一样。采用递归...</span> </div> <div class="art_confoot"></div> </span> </li> </ol>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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