Php数组条目值和返回键

Question

您好我有一个$_SESSION["product"]数组，$_SESSION["product"] print_r输出是：

Array
(
    [0] => Array
        (
            [id] => 152
            [name] => 0
            [total] => 3
        )

    [1] => Array
        (
            [id] => 343
            [name] => 0
            [total] => 5
        )

    [2] => Array
        (
            [id] => 799
            [name] => 0
            [total] => 7
        )

)

我想搜索id时输出并找到主键例如;当我写799时，输出为2或

$_SESSION["product"][2]

Answer 1

只需循环并检查ID。例如：

$search = 799;

foreach( $products as $key => $product ) {
    if( $product[ 'id' ] == $search ) {
       $item = $product;
       break;
    }
}

print_r( $product );

这是未经测试的btw。这将打印出与id匹配的项目。如果您只想使用密钥，请改用它。

$item = $key;

Answer 2

一个简单的foreach循环就可以做到这一点。当你点击预期的id时，返回数组记录的密钥。

$search_for = 799;

foreach($_SESSION["product"] as $key => $data) {
    if($data['id'] == $search_for) {
        $result = $key;
        break;
    }
}

if($result) {
    echo 'Result is: ' . $result;
} else {
    echo 'No match';
}

Answer 3

尚未测试，但应该有效：

$search = 799; // id to search
foreach($_SESSION["product"] as $key => $array) // Look through session array
{
    if($array["id"] == $search) // Found your id
    {
        $output = $key; // Set id to variable
        break; // Exit loop
    }
}
echo $output; // Your output

Answer 4

试试这个

function getIndex($name, $array){
    foreach($array as $key => $value){
        if(is_array($value) && $value['id'] == $name)
            return $key;
    }
    return null;
}
$array = Array(
    array(
        'id' => 152,
        'name' => 0,
        'total' => 3
    ),

    array(
        'id' => 152,
        'name' => 0,
        'total' => 3
    ),

    array(
        'id' => 799,
        'name' => 0,
        'total' => 7
    ),
);
print_r('<pre>');
print_r($array);
echo getIndex(799, $array);

Answer 5

只需使用 array_search()

即可

$i=0;
foreach($arr as $val_arr)
{
    $key = array_search(799,$val_arr);
    if(!empty($key))
    {
        echo $i; //"prints" 2
    }
    $i++;

}