如何从文本行中减去某些字符串并获取剩余的字符串

Question

I have a text line of 12345678910 in my solution, I want to get 8910 in one line using the function substr() I have tried:

$text = "12345678910";
$pay = substr($text,0,7);
echo $pay;

But I get 1234567 expected 8910
Thanks in advance

Answer 1

使用-4作为第二个参数。

echo substr("1234567890", -4);

Answer 2

You've misread the manual, the second parameter is the starting position and the third is the length. So you are telling it to start at the start of the string and go 7 characters in. You could do:

$pay = substr($text,7);

or

$pay = substr($text,7, 4);

or the negative as the other answer suggests.

Answer 3

Just do this.

<?php
$text = "12345678910";
$pay = substr($text,7);
echo $pay;