php - 如何获取 PHP 字符串的最后 7 个字符？

Question

我将如何获取下面字符串的最后 7 个字符？

例如:

$dynamicstring = "2490slkj409slk5409els";
$newstring = some_function($dynamicstring);
echo "The new string is: " . $newstring;

将显示的内容:

The new string is: 5409els

Answer 1

使用 substr()第二个参数为负数。

$newstring = substr($dynamicstring, -7);

来自php docs :

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

If start is negative, the returned string will start at the start'th character from the end of string.