This article mainly introduces PHP file and directory operations, involving PHP's operation skills related to file and directory traversal, judgment and sorting. There are more detailed instructions in the comments. Friends in need can refer to it
The examples in this article describe PHP file and directory operations. Share it with everyone for your reference, the details are as follows:
File directory related functions
<?php // 输出目录中的文件 function outputcurfiles ($allowedtypes, $thedir){ //首先,我们确保目录存在。 if (is_dir ($thedir)){ //现在,我们使用scandir扫描目录中的文件。 $scanarray = scandir ($thedir); //接着我们开始解析数组。 //scandir()用“.”和“..”统计文件导航列表 //因此作为文件,我们不应该列出他们。 for ($i = 0; $i < count ($scanarray); $i++){ if ($scanarray[$i] != "." && $scanarray[$i] != ".."){ //现在,进行检查,以确保这是一个文件,而不是一个目录。 if (is_file ($thedir . "/" . $scanarray[$i])){ //现在,因为我们将允许客户端编辑这个文件, //我们必须检查它是否是可读和可写。 if (is_writable ($thedir. "/" . $scanarray[$i]) && is_readable($thedir . "/" . $scanarray[$i])){ //现在,我们检查文件类型是否存在于允许的类型数组中. $thepath = pathinfo ($thedir . "/" . $scanarray[$i]); if (in_array ($thepath['extension'], $allowedtypes)){ //如果文件符合规定,我们可以继续输出. echo $scanarray[$i] . "<br />"; } } } } } } else { echo "对不起,这个目录不存在."; } } $allowedtypes = array ("txt","html"); outputcurfiles ($allowedtypes, "testfolder"); /////////////////////////////////////////////////// function recurdir ($thedir) { //First attempt to open the directory. try { if ($adir = opendir ($thedir)){ //扫描目录。 while (false !== ($anitem = readdir ($adir))){ //不统计目录中包含“.”或“..”的情况 if ($anitem != "." && $anitem != ".."){ //此时如果是一个目录,则缩进一点 //再去递归 if (is_dir ($thedir . "/" . $anitem)){ ?><span style="font-weight: bold;" mce_style="font-weight: bold;"><?php echo $anitem; ?></span><?php ?><p style="margin-left: 10px;" mce_style="margin-left:10px;"><?php recurdir ($thedir . "/" . $anitem ); ?></p><?php } elseif (is_file ($thedir . "/" . $anitem)){ //此时输出文件. echo $anitem . "<br />"; } } } } else { throw new exception ("Sorry, directory could not be openend."); } } catch (exception $e) { echo $e->getmessage(); } } echo "<br />/////////////////////////////////////<br /><br />"; recurdir("testfolder"); ////////////////////////////////////////////////////////////////// echo "<br />/////////////////////////////////////<br /><br />"; function sortfilesbydate ($thedir){ //首先,需要确保目录存在。 if (is_dir ($thedir)){ //接着,我们使用scandir扫描此目录中的文件. $scanarray = scandir ($thedir); $finalarray = array(); //然后开始解析数组 //scandir()用“.”和“..”统计文件导航列表 //因此作为文件,我们不应该列出他们. for ($i = 0; $i < count ($scanarray); $i++){ if ($scanarray[$i] != "." && $scanarray[$i] != ".."){ //现在,我们检查,以确保这是一个文件,而不是一个目录. if (is_file ($thedir . "/" . $scanarray[$i])){ //现在需要做的是循环数据到一个关联数组. $finalarray[$thedir . "/" . $scanarray[$i]] = filemtime ($thedir . "/" . $scanarray[$i]); } } } //至此,我们已经遍历了整个数组,现在需要做的只是asort()它。 asort ($finalarray); return ($finalarray); } else { echo "对不起,这个目录不存在."; } } //然后,我们将函数指向我们需要查看的目录. $sortedarray = sortfilesbydate ("testfolder"); //至此,就可以按照如下形式输出: while ($element = each ($sortedarray)){ echo "File: " . $element['key'] . " was last modified: " . date ("F j, Y h:i:s", $element['value']) . "<br />"; } ?>
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

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。


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