


PHP readdir function usage example, readdir function example
The example in this article describes the usage of readdir function in php. Share it with everyone for your reference. The specific usage analysis is as follows:
Definition and usage: The readdir() function returns the entry in the directory handle opened by opendir(). If successful, the function returns a file name, otherwise it returns false.
Example 1, the code is as follows:
// Determine whether it is a directory
if (is_dir($dir)) {
If ($dh = opendir($dir)) {
While (($file = readdir($dh)) !== false) {
echo "filename: $file : filetype: " . filetype($dir . $file) . " ";
}
closedir($dh);
}
}
Example 2, Note that the !== operator did not exist before 4.0.0-RC2, The code is as follows:
echo "Directory handle: $handle ";
echo "Files: ";
/* This is the correct way to traverse the directory */
While (false !== ($file = readdir($handle))) {
echo "$file ";
}
/* This is the wrong way to traverse the directory */
While ($file = readdir($handle)) {
echo "$file ";
}
closedir($handle);
}
Example 3, readdir() will return . and .. entries. If you don’t want them, just filter them out. Example 2. List all files in the current directory and remove . and .., the code is as follows:
While (false !== ($file = readdir($handle))) {
If ($file != "." && $file != "..") {
echo "$file ";
}
}
closedir($handle);
}
Note: readdir must be used in conjunction with opendir.
I hope this article will be helpful to everyone’s PHP programming design.

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。

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。

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)”。


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