Question

我有一个字符串数组值，但是我不知道如何在sql语句中使用它。

我尝试使用内爆，但没有任何反应。

这是我的代码：

$select_tbl=mysqli_query($conn, "SELECT * FROM users WHERE firstname='$firstname' AND lastname='$lastname'");
while($fetch=mysqli_fetch_object($select_tbl)) {
    $r = $fetch->lessons;
    $i = explode(",",$r);
    foreach ( $i as $item ) {
        $string .= $item.',';
        echo $string;
    }
}


$_SESSION['library'] = $_GET['library'];
$_SESSION['lessonID'] = $_GET['lessonID'];
$_SESSION['department'] = $_GET['department'];
$dept = $_SESSION['dept'];
$library = $_SESSION['library'];

$checkID = mysqli_real_escape_string($conn, $_GET["lessonID"]);
$checkdept = mysqli_real_escape_string($conn, $_GET["department"]);
$department = mysqli_real_escape_string($conn, $_SESSION['dept']);
$sql = "SELECT * FROM gallery 
        WHERE lessonID = '$checkID' AND departmentg='$checkdept' AND library='$library' AND titleGallery='$string'";
$stmt = mysqli_stmt_init($conn);

我想在代码中获取 foreach 语句的字符串数组，以便可以将其用于 SELECT 中的 WHERE 子句>声明。

Answer 1

这里您正在执行字符串到数组和数组到字符串的转换：

$r = $fetch->lessons; //string
$i = explode(",",$r); //array
foreach ( $i as $item ) { //array parsing
  $string .= $item.','; //string
}

相反，您可以使用：

//declare string array before while loop
$string_array = array();
$string_array = array_merge($string_array,explode(',',$fetch->lessons)); //Final Array

您可以在sql查询中使用：

$sql = "SELECT * FROM gallery WHERE lessonID = '$checkID' AND departmentg='$checkdept' AND library='$library' AND titleGallery IN (".implode(',',$string_array).")";

mysql WHERE语句中的字符串数组值

1 个答案: