从左和右修剪字符串

Question

如何从字符串的左侧和右侧修剪 5 个字符。例如，

4k2l3k4jc9l3kancie9

应该修剪和保留的内容是：

4k2l3      k4jc9l3ka     ncie9
  ^            ^           ^
remove        keep       remove

Answer 1

$string = substr($string, 5, -5);

Answer 2

$string = substr($string, 5, -5);//from left
$string = substr($string, 0, 5);//from right