从序列列表创建邻接结构

你可以这样做:

for ($i = 0; $i < count($arr); $i++) {
    $splitString = explode(',', $arr[i]); //split the string on the point
    if (strlen($splitString) > 1) {
        $arr1[i] = $splitString[1]; // take the part after the point
    }
    else {
        $arr1[i] = "0"; // no part after the point, so default to 0
    }
}