PHP?? "Trying to Access Array Offset on Value of Type Null" ??
? ??? ??????? no? ??? ? ??????? ???? ?? ?????. ???? ? ?? ?? ??? ?? ???????. ???? ???? ??? ?????? ??? null ?? ? ??? ?????.
??? ????? ?? ???? ????? ?????? ?? ??? ?????. ?? ?? ??????.
$monday_lectures = "SELECT * from lectures where lecture_time = '11am to 1pm' and lecture_day = 'firday'";
$result_11to1 = mysqli_query($con, $monday_lectures);
$m11to1 = mysqli_fetch_array($result_11to1);
if ($m11to1 && $m11to1["lecture_day"] == !'') {
echo "<td>".$m11to1["lecture_name"]."</td>";
} else {
echo "<td> no class</td>";
}
?? ??? ?? ?? ?? ??? ?? ?? ?? ???? ??? ? ????.
$monday_lectures = "SELECT * from lectures where lecture_time = '11am to 1pm' and lecture_day = 'firday'"; $result_11to1 = mysqli_query($con, $monday_lectures); $m11to1 = mysqli_fetch_array($result_11to1); $lecture = $m11to1["lecture_day"] ?? null;
PDO?? ??? ?? ??? ?????. :
$monday_lectures = $pdo->prepare("SELECT * from lectures where lecture_time = '11am to 1pm' and lecture_day = 'firday'");
$monday_lectures->execute();
$m11to1 = $monday_lectures->fetch();
$lecture = $m11to1["lecture_day"] ?? null;? ??? PHP?? 'Null ?? ?? ?? ???? ????? ?' ??? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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