How to determine the number of characters in a string in php

php method to determine the number of characters in a string: 1. Use the strlen() function to get the number of characters in the English string, the syntax is "strlen($str)"; 2. Use the mb_strlen() function , syntax "mb_strlen($str,$encoding)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

How to determine characters in php How many digits does a string have?

Determine how many digits a string has, that is, determine how many characters a string has, that is, get the length of the string.

php provides two built-in functions to get the string length.

• strlen(): Get the length of the English string

  In the strlen() function, numbers, English, decimal point, underline and space occupy one character length; and one A GB2312 encoded Chinese character occupies two characters in length, and a UTF-8 encoded Chinese character occupies three characters in length.
  

• mb_strlen(): Get the length of Chinese or English string

  In the mb_strlen() function, whether it is Chinese characters, English, numbers, decimal points, Underscores and spaces are only one character in length.
  

1. Use strlen() function

<?php
header("Content-type:text/html;charset=utf-8");
$str = "hello world!";
echo &#39;字符串 “&#39;.$str.&#39;” 是：&#39;.strlen($str).&#39; 位的<br>&#39;;

$str = "12365";
echo &#39;字符串 “&#39;.$str.&#39;” 是：&#39;.strlen($str).&#39; 位的<br>&#39;;
?>

2. Use The mb_strlen() function

mb_strlen($str,$encoding) can return the corresponding number of characters by setting the character encoding, which solves the problem of the length of Chinese strings well. . The return value of the

mb_strlen() function is the number of characters contained in the string $str with $encoding encoding, if $encoding If invalid, return false.

<?php
header("Content-type:text/html;charset=utf-8");
$str = "hello world!,#%&*@";
echo &#39;字符串 “&#39;.$str.&#39;” 是：&#39;.mb_strlen($str).&#39; 位的<br>&#39;;

$str = "欢迎来到PHP中文网";
echo &#39;字符串 “&#39;.$str.&#39;” 是：&#39;.mb_strlen($str,"utf-8").&#39; 位的<br>&#39;;
?>

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