如何从PHP字符串中仅取出数字？

Question

假设,我有这个字符串:

$string = "Hello! 123 How Are You? 456";

我想将变量设置$int为$int = 123456;

我该怎么做？

例2:

$string = "12,456";

需要:

$num = 12456;

谢谢!

Answer 1

正确的变体将是:

$string = "Hello! 123 How Are You? 456";
$int = intval(preg_replace('/[^0-9]+/', '', $string), 10);