用php中的另一个字符串替换数字

Question

如何用其他数字替换数字，例如

$str = "www.mysite.com/campagin_id=12345";

我想用另一个号码6789替换12345

所以输出将是

www.mysite.com/campagin_id=6789

Answer 1

str_replace('12345', '6789', $str);

Answer 2

$str = "www.mysite.com/campagin_id=12345";

preg_replace("/id=(\d+)$/", "6789", $str);

<强>输出：

www.mysite.com/campagin_id=6789

Demo

Answer 3

免费解决方案

<?php
$str='www.mysite.com/campagin_id=12345';
$yournum = 6789;
echo $var = explode('=',$str)[0]."=".$yournum;

<强> OUTPUT :

www.mysite.com/campagin_id=6789

Demo