php字符串函数学习之substr()

(编辑：jimmy 日期: 2024/9/30 浏览：2)

<"abcdefghijklmn";

$rest = substr($str, 0); // 返回 "abcdefghijklmn"
echo $rest . " ";

$rest = substr($str, 1, 3); // 返回 "bcd"
echo $rest . " ";

$rest = substr($str, -3); // 返回 "lmn"
echo $rest . " ";

$rest = substr($str, -3, 2); // 返回 "lm"
echo $rest . " ";

$rest = substr($str, 1, -3); // 返回 "bcdefghijk"
echo $rest . " ";

$rest = substr($str, -7, -3); // 返回 "hijk"
echo $rest . " ";
?>