How to get the digit value of a number in php

Acquisition method: 1. Use the substr() function, the syntax is "substr($num, n-1,1)", the parameter n is the number of digits to obtain the value; 2. Use the mb_substr() function , the syntax is "mb_substr($num, n-1,1)", the parameter n is the number of digits to obtain the value.

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

php gets the number The first digit value

Method 1: Use the substr() function

<?php
header("Content-type:text/html;charset=utf-8");
$num=12345;
echo "数字为：".$num."<br>";
echo "数字第1位的值：".substr($num, 0 ,1)."<br>";
echo "数字第2位的值：".substr($num, 1 ,1)."<br>";
echo "数字第3位的值：".substr($num, 2 ,1)."<br>";
?>

Description: substr( ) function can intercept characters of a certain length from a specified position in a string.

Method 2: Use the mb_substr() function

<?php
header("Content-type:text/html;charset=utf-8");
$num=123456;
echo "数字为：".$num."<br>";
echo "数字第1位的值：".mb_substr($num, 0 ,1)."<br>";
echo "数字第2位的值：".mb_substr($num, 1 ,1)."<br>";
echo "数字第3位的值：".mb_substr($num, 2 ,1)."<br>";
echo "数字第4位的值：".mb_substr($num, 3 ,1)."<br>";
echo "数字第5位的值：".mb_substr($num, 4 ,1)."<br>";
?>

Description: The mb_substr() function is similar to the substr() function. Characters of a certain length can be intercepted from the specified position of the string; but unlike the substr() function, the mb_substr() function is not only valid for English characters, but also for Chinese characters.

Recommended learning: "PHP Video Tutorial"

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