Question

Array ( [0] => Array ( [0] => Array ( [subject] => Computer [price] => 33.00 [quantity] => 1 ) ) )

我有一个如上所示的数组，但是当我使用下面的in_array检查主题值时，它将显示否定结果。

foreach ($cart_info as $item){
    foreach ($item as $item2){
        if (in_array("Computer", $item2['subject'])) {
        echo "Yes";
        }else{
            echo "No";
        }   
    }
}

Answer 1

haystack应该是一个数组

请查看in_array

的文档

bool in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] )

 haystack

    The array.
strict

    If the third parameter strict is set to TRUE then the in_array() function will also check the types of the needle in the haystack.

参考：http://in2.php.net/in_array

Answer 2

您传递的是错误的密钥，因此无法获得所需的输出。

应该是

in_array("Computer", $cart_info[0])

或

in_array("Computer", $cart_info)

甚至

 if($item2 == "Computer")

而不是

in_array("Computer", $item2['subject'])

Answer 3

试

if (in_array("Computer", $item2)) {
   echo "Yes";
}else{
   echo "No";
}

Answer 4

因为$item2['subject']不是数组。在您的情况下使用：

foreach ($cart_info as $item){
    foreach ($item as $item2){
        if ("Computer" == $item2['subject'])) {
        echo "Yes";
        }else{
            echo "No";
        }   
    }
}

php foreach循环in_array不显示正面结果

4 个答案: