In PHP, you can directly use the rmdir() function to delete an empty directory. The function of this function is to delete the specified empty directory. The syntax is "rmdir(directory path[,context])"; if the deletion is successful, it will return TRUE, or FALSE on failure.
The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
You can use the rmdir() function in PHP Delete the specified directory. It should be noted that the directory deleted by the rmdir() function must be an empty directory and must have corresponding permissions.
The syntax format of the rmdir() function is as follows:
rmdir(string $dirname[, resource $context])
Among them, the parameter $dirname is the directory path to be deleted; $context is an optional parameter, used to specify the file The handle's environment.
Return value: TRUE is returned when the function is successfully executed, and FALSE is returned when the function fails.
Example: Delete the test directory (empty directory)
Implementation code:
<?php header("Content-type:text/html;charset=utf-8"); $dir = 'test'; if (is_dir($dir)) { if (rmdir($dir)) echo '目录删除成功!'; } else { echo "目录不存在!"; } ?>
Output Result:
Note: If you delete a directory that is not empty, an E_WERNING level error will be generated.
Example: Delete img directory (not empty)
<?php header("Content-type:text/html;charset=utf-8"); $dir = 'img'; if (is_dir($dir)) { if (rmdir($dir)) echo '目录删除成功!'; } else { echo "目录不存在!"; } ?>
If you want to delete For a directory that is not empty, you can use the recursive method to first clear the directory, and then use the rmdir() function to delete the directory. To implement the code, please refer to the article "php rmdir() How to delete a non-empty directory"
Recommended study: "PHP Video Tutorial"
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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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