Question

我目前有一个查询，它获取数据，然后运行另一个查询。然后我回应第二个查询的结果。我想做的是将回声移到foreach循环之外，但我不知道该怎么做。

$ids = 2,3;
$id = explode(",",$ids);

$barcode = array();

foreach($id as $value) {
    $sql_query = $db->prepare("SELECT barcode FROM product WHERE id=:value");
    $sql_query->bindParam(":value", $value);
    $sql_query->execute();
    $row = $sql_query->fetch(PDO::FETCH_ASSOC);
    $barcode = $row['barcode'];


    /* I want to move this part starting from here outside the foreach */ 

    $sql_select_all = $db->prepare("SELECT * FROM inventory WHERE barcode=:barcode");
    $sql_select_all->bindParam(":barcode", $barcode);
    $sql_select_all->execute();
    while($row = $sql_select_all->(PDO::FETCH_ASSOC)){

        $name = $row['name'];
        $img = $row['image'];
        $desc = $row['desc'];

        echo $name.$img.$desc;
    }
    /* ending here */

}

如何将回声线移出foreach循环？

Answer 1

尝试

foreach($id as $value){
$sql_query = $db->prepare("SELECT barcode FROM product WHERE id=:value");
$sql_query->bindParam(":value", $value);
$sql_query->execute();
$row = $sql_query->fetch(PDO::FETCH_ASSOC);
// make array with the entry
$barcode[] = '"'.$row['barcode'].'"';    
}
// after foreach we explode the array and add comma , 
$barcode = explode(',',$barcode)

// using mysql ( [IN][1] ) query instead of ( = )
$sql_select_all = $db->prepare("SELECT * FROM inventory WHERE barcode in ($barcode)'");
$sql_select_all->bindParam(":barcode", $barcode);
$sql_select_all->execute();
while($row = $sql_select_all->(PDO::FETCH_ASSOC)){

$name = $row['name'];
$img = $row['image'];
$desc = $row['desc'];

echo $name.$img.$desc;

using IN() Function

Answer 2

您需要做的是将第二个查询的结果存储到数组中。然后你可以将回显移出for循环并在你的新数组上运行一个循环，如下所示：

$ids = 2,3;
$id = explode(",",$ids);

$barcode = $results = array();

foreach($id as $value){
    $sql_query = $db->prepare("SELECT barcode FROM product WHERE id=:value");
    $sql_query->bindParam(":value", $value);
    $sql_query->execute();
    $row = $sql_query->fetch(PDO::FETCH_ASSOC);
    $barcode = $row['barcode'];


    /*i want to move this part starting from here outside the foreach*/ 

    $sql_select_all = $db->prepare("SELECT * FROM inventory WHERE barcode=:barcode");
    $sql_select_all->bindParam(":barcode", $barcode);
    $sql_select_all->execute();
    while($row = $sql_select_all->(PDO::FETCH_ASSOC)){
        $results[] = $row;
        //$name = $row['name'];
        //$img = $row['image'];
        //$desc = $row['desc'];

        //echo $name.$img.$desc;
    }
    /*ending here*/
    foreach($results as $row) {
        echo $row['name'] . $row['image'] . $row['desc'];
    }

}

PHP foreach和之后循环

2 个答案: