How to get the characters after the number in php

Two methods: 1. Use the substr() function to intercept English strings, the syntax is "substr(string, starting position, number of characters)"; 2. Use the mb_substr() function to intercept Chinese or Chinese English mixed string, syntax "mb_substr(string, starting position, number of characters, "character encoding")".

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

php provides two methods to extract the string Characters after the number:

• substr()

• mb_substr()

##substr () has similar functions to mb_substr(), but substr() is only useful for English strings, while mb_substr() is useful for Chinese, Chinese-English mixed, and English strings.

1. Use the substr() function

substr($string, $start [, $length])

The parameter description is as follows:

• $string: the string that needs to be intercepted , the string contains at least one character;

• $start: intercept the starting position of the string;

• $length: optional parameter , indicating the length of the intercepted string.

If you want to intercept characters after the Nth digit, $start needs to be set to

N (because characters are counted from 0, N-1 1 =N).

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="Hello world";
echo "原字符串：".$str."<br>";
echo "取第1位之后的一个字符：".substr($str,1,1)."<br>";
echo "取第2位之后的一个字符：".substr($str,2,1)."<br>";
echo "取第3位之后的2个字符：".substr($str,3,2)."<br>";
echo "取第4位之后的全部字符：".substr($str,4)."<br>";
?>

2. Use the mb_substr() function

mb_substr($str , $start [, $length = NULL [, $encoding = mb_internal_encoding()]])

mb_substr() is better than substr( ) function has an additional optional parameter $encoding: indicating the character encoding of $str. If omitted, the internal character encoding is used.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;php中文网是一个在线学习编程的网站&#39;;
echo "原字符串：".$str."<br>";
echo "取第1位之后的一个字符：".mb_substr($str,1,1,"utf-8")."<br>";
echo "取第2位之后的一个字符：".mb_substr($str,2,1,"utf-8")."<br>";
echo "取第3位之后的2个字符：".mb_substr($str,3,2,"utf-8")."<br>";
?>

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