How to intercept the last four digits of a string in PHP

This article mainly introduces how to intercept the last four digits of a string. Interested friends can refer to it. I hope it can help everyone.

$str_bh='123456789';$abc=substr($str_bh,-4);
echo $abc;
//输出结果：6789

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<?php
echo substr("Hello world!",6,5);
?>
//结果：world

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