復制代碼 代碼如下:

$result = substr (“abcdef”, 1);
echo($result);

復制代碼 代碼如下:

$result = substr (“abcdef”, 1,3);
echo($result);

復制代碼 代碼如下:

$result = substr (“abcdef”, -1);
echo($result);

復制代碼 代碼如下:

$result = substr (“abcdef”, -2);
echo($result);

復制代碼 代碼如下:

$result = substr (“abcdef”, -3,1);
echo($result);