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When developing APIs, we usually need to perform parameter verification to ensure that the request parameters sent by the client meet the expected structure and format. PHP provides many built-in functions to help us implement these tasks, where the array_diff_ukey() function can play a very efficient role in parameter verification.
array_diff_ukey() is a function that compares two arrays, but the difference between it and array_diff() is that array_diff_ukey() is compared by the keys of the array. It receives two arrays and returns an array of elements with all keys that are not equal, which is especially useful when checking for parameters, especially when checking whether some API requests contain unnecessary parameters.
The basic syntax of the array_diff_ukey() function is as follows:
array_diff_ukey(array $array1, array $array2, callable $key_compare_func): array
$array1 and $array2 : Two arrays to compare.
$key_compare_func : A callback function that compares the keys of two arrays.
In API parameter verification, we usually need to check whether the request sent by the client contains the parameters we expect, and exclude unnecessary or unnecessary parameters. We can use array_diff_ukey() to accomplish this task.
Suppose we have an array of parameters for API requests, and the client sends a request with extra parameters, and we need to remove these irrelevant parameters from it and only retain the parameters we care about.
Suppose we expect the client request to include the following parameters:
$requiredParams = ['name', 'age', 'email'];
The request parameter array sent by the client is as follows:
$requestParams = [
'name' => 'John',
'age' => 30,
'email' => 'john@example.com',
'extra_param' => 'value',
];
We want to remove extra_param from $requestParams , and we can use array_diff_ukey() to verify:
// Define a callback function，Compare whether the key is in $requiredParams middle
$keyCompareFunc = function ($key1, $key2) use ($requiredParams) {
return in_array($key1, $requiredParams) ? 0 : 1; // Only the required parameters are retained
};
// use array_diff_ukey() Perform filtering
$filteredParams = array_diff_ukey($requestParams, array_flip($requiredParams), $keyCompareFunc);
print_r($filteredParams);
The output result will be:
Array
(
[name] => John
[age] => 30
[email] => john@example.com
)
As shown above, extra_param is successfully removed from the request parameter array.
Sometimes, we need not only exclude additional parameters, but also more complex verifications, such as checking whether the values of certain parameters meet the expected type. We can achieve this by combining array_diff_ukey() and other verification logic.
Suppose we expect the parameter age to be an integer and email is a valid email address. We can continue these types of verification after filtering the parameters:
// Define a callback function，Perform type verification
$keyCompareFunc = function ($key1, $key2) use ($requiredParams) {
return in_array($key1, $requiredParams) ? 0 : 1; // Only the required parameters are retained
};
// Filter out unnecessary parameters
$filteredParams = array_diff_ukey($requestParams, array_flip($requiredParams), $keyCompareFunc);
// Type verification
if (isset($filteredParams['age']) && !is_int($filteredParams['age'])) {
echo 'Age must be an integer';
}
if (isset($filteredParams['email']) && !filter_var($filteredParams['email'], FILTER_VALIDATE_EMAIL)) {
echo 'Invalid email format';
}
print_r($filteredParams);
In this example, first we filter unnecessary parameters and then type check the age and email .
By rationally utilizing the array_diff_ukey() function, we can efficiently checksum filter parameters in API requests. It not only helps us eliminate unnecessary parameters, but also plays an important role in complex verification logic. For APIs that require strict control of request parameters, array_diff_ukey() is a very practical tool.
Related Tags:
API
