Question

我有一个与我希望用foreach循环处理的名称相关联的id数组，但是我得到一个错误，上面写着：Undefined offset：n。

我知道这是因为内部数组的长度不同，所以如何解决这个问题呢？我想收集每个名称并在一个函数或循环中查询它们到我的数据库

Array
( 
[id_1] => Array
    (
        [0] => "Jim"
    )

[id_2] => Array
    (
        [0] => "John"
        [1] => "Mike"
        [2] => "Mary"

    )

[id_3] => Array
    (
        [0] => "Elizabeth"
        [1] => "Ashley"
    )
)

我要运行的查询是＆＃34; SELECT * FROM table WHERE id = id AND name = name＆＃34;

使用的foreach循环是：

$count = 0;
foreach ($myArray as $key => $value) {
    echo $key . ": " . $value[$count] . '<br>';
    $count++;

}

Answer 1

使用PHP implode连接名称值并在MySQL WHERE子句中使用IN：

// Test array
$myArray = array(
    "id_1" => array("Jim"),
    "id_2" => array(
        "John",
        "Mike",
        "Mary"
    ),
    "id_3" => array(
        "Elizabeth",
        "Ashley"
    )
);

foreach($myArray as $id => $names) {
    // Prepare the MySql statement.
    $sqlStr = "SELECT * FROM table WHERE ";
    $sqlStr .= "id = '" . $id . "' ";
    $sqlStr .= "AND name IN ('" . implode("', '", $names) . "')";

    // Execute the query here..
}

php - 处理具有不同内部数组长度的多维数组

1 个答案: