How to obtain GET parameters repeatedly in php (skill sharing)

When PHP uses the GET method to submit form data to the server, sometimes we want to obtain unique values. This article will introduce some techniques using PHP to achieve this goal.

Use the in_array() function

The in_array() function can be used to determine whether an element exists in the array. In the process of achieving non-repeated acquisition of GET parameters, we can first obtain all passed parameters through $_GET, then traverse the array, and use the in_array() function to determine whether the new element already exists in the result array. If it does not exist, added to the result array.

The sample code is as follows:

if ($_GET) {
    $params = array(); // 用于存储不重复的GET参数
    foreach ($_GET as $key => $value) {
        if (!in_array($value, $params)) {
            $params[$key] = $value;
        }
    }
}

Using the array_unique() function

The array_unique() function can be used to remove duplicate elements in the array. In the process of not repeatedly obtaining GET parameters, we can first obtain all passed parameters through $_GET, and then use the array_unique() function to deduplicate the array.

The sample code is as follows:

if ($_GET) {
    $params = array_unique($_GET);
}

Use foreach loop to remove duplicates

In addition to the above two methods, we can also use foreach loop to directly traverse the array and combine each element with All previous elements are compared, and if there are no duplicates, they are added to the result array.

The sample code is as follows:

if ($_GET) {
    $params = array(); // 用于存储不重复的GET参数
    foreach ($_GET as $key => $value) {
        $is_duplicate = false; // 是否重复的标识符
        foreach ($params as $param) {
            if ($value === $param) {
                $is_duplicate = true;
                break;
            }
        }
        if (!$is_duplicate) {
            $params[$key] = $value;
        }
    }
}

Summary

Non-repeated acquisition of GET parameters is often used in actual development. This article introduces three implementation methods, namely using in_array () function, array_unique() function and foreach loop to remove duplicates. Each method has its own characteristics and applicable scenarios, and we can choose the appropriate method according to actual needs.

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