How to detect how many digits an integer has in php

php method to detect how many digits an integer has: 1. Use the strval() function to convert the integer into a numeric string, the syntax is "$str = strval($int);"; 2. Use strlen( ) function to get the length of a numeric string (the number of numeric characters), the syntax is "strlen($str)".

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

The number of digits in a natural number is called digits . The number of digits in a natural number is called digits. A number containing one digit is a one-digit number, a number containing two digits is a two-digit number, a number containing three digits is a three-digit number... A number containing n digits is an n-digit number.

For example, 123 occupies three digits, and the number of digits is 3

SoHow to use PHP to detect how many digits an integer has?

Implementation idea:

• Convert integers to numeric strings. (Conversion method strval() or settype() function)

• Use strlen() or mb_strlen() function to get the length of the numeric string (number of numeric characters)

Implementation code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$int= 123;
$str = strval($int);
$result=strlen($str);
echo "整数 ".$int." 是 ".$result." 位数。";
?>

## Description:

in PHP There are two functions commonly used to calculate the length of strings, namely the strlen() and mb_strlen() functions. When processing all-English strings, the effect of these two functions is the same, but when processing mixed Chinese and English strings or pure Chinese strings, these two functions will have some differences.

• In the strlen() function, numbers, English, decimal points, underscores and spaces occupy one character length; while a GB2312 encoded Chinese character occupies two characters in length, and a UTF-8 encoding The Chinese characters are three characters long.

• Different from the strlen() function, in the mb_strlen() function, whether it is Chinese characters, English, numbers, decimal points, underscores and spaces, they only occupy one character in length.

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