This article mainly introduces the method of using PHP function to calculate the length of Chinese and English string. The example compares the PHP function implementation method with regular expression The implementation method has certain reference value. Friends who need it can refer to
. This article describes the method of using PHP functions to calculate the length of Chinese and English strings. Share it with everyone for your reference. The specific implementation method is as follows:
Generally speaking, everyone knows that English characters occupy one byte, while Chinese characters gbk occupies two characters, and utf8 occupies three characters. Many people have the impression that PHP calculates the length of a string by strlen( ) function, actually it is not the case. It calculates the length of bytes rather than the length of characters. So how to get the length of characters in a string? There is also mb_strlen().
The specific code is as follows:
The code is as follows:
echo $str = 'PHP点点通'; echo strlen($str); //3*1+3*3=12 echo mb_strlen($str, 'gb2312'); //3*1+3*2=9 echo mb_strlen($str, 'utf-8'); //6
What’s terrible is that the mb series functions are not PHP core functions. It is not turned on by default. There is also a super simple method to decompose the string into individual characters through regular expressions. Calculating the number of characters is the length of the string. The code is as follows:
The code is as follows:
<?php function _strlen($str) { preg_match_all("/./us", $str, $matches); return count( current ($matches)); } echo _strlen("PHP点点通"); //6 ?>
The above is the detailed content of How to calculate string length in php. For more information, please follow other related articles on the PHP Chinese website!

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。

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。

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。

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。

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。


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