How to find multiple values ​​in an array in PHP and return the corresponding key names

How to find multiple values ​​in an array and return the corresponding key name in PHP

In PHP development, we often encounter the need to find multiple values ​​in an array and find the key of the corresponding value name situation. This article will introduce a method to achieve this function and provide corresponding code examples.

First, let's look at the structure of the array we are looking for. Suppose we have an associative array that stores some user information, such as username, age, and gender. An example is as follows:

$user_info = array(
    'john' => array(
        'age' => 25,
        'gender' => 'male'
    ),
    'amy' => array(
        'age' => 32,
        'gender' => 'female'
    ),
    'peter' => array(
        'age' => 28,
        'gender' => 'male'
    ),
    'susan' => array(
        'age' => 30,
        'gender' => 'female'
    )
);

Now, suppose we need to find a user whose age is 32 years old and whose gender is female. We hope to get the key name of the user, which is 'amy'. The following is a code example to implement this function:

function searchUser($array, $conditions) {
    foreach ($array as $key => $value) {
        $match = 0;
        foreach ($conditions as $condition_key => $condition_value) {
            if ($value[$condition_key] == $condition_value) {
                $match++;
            }
        }
        if ($match == count($conditions)) {
            return $key;
        }
    }
    return null;
}

$conditions = array(
    'age' => 32,
    'gender' => 'female'
);

$result = searchUser($user_info, $conditions);

if ($result) {
    echo "找到匹配的用户，键名为：" . $result;
} else {
    echo "未找到匹配的用户";
}

In the above code, we define a function named searchUser, which accepts two parameters: the array to be searched and the search conditions .

Inside the function, we use two levels of nested loops. The outer loop traverses each element of the array, and the inner loop traverses each condition in the search condition array.

In the inner loop, we compare whether the value of the corresponding key in the array is equal to the current search condition. If they are equal, we increment the value of a counter $match. If the value of $match is equal to the length of the search condition array, it means that all conditions are matched, and we return the key name of the current loop.

If no matching user is found, we end up returning null.

In the main program, we define an array of search conditions $conditions, and then call the searchUser function to find matching users. Finally, based on the returned results, we output the corresponding prompt information.

Through the above code example, we can realize the function of finding multiple values ​​in an array and returning the corresponding key name.

Summary:
In PHP development, sometimes we need to find multiple values ​​in an array and return the corresponding key names. By using a double loop and appropriate judgment conditions, we can achieve this functionality. The above code example provides an implementation method for your reference and use. I hope this article will be helpful to everyone in PHP array search.

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