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In many development scenarios, the data returned by the API may change, especially when performing data synchronization, status monitoring or debugging, it is very important to determine which fields have changed. PHP provides the array_diff_uassoc function, which can not only be used to compare the differences between two arrays, but also customize the comparison logic during the comparison process. This is especially useful for finding field changes from the data we return from the API.
The array_diff_uassoc function is used to calculate the difference between two arrays. It compares the key names and values of two arrays, returning key-value pairs that exist in the first array but not in the second array. This function can accept a custom callback function to compare elements of an array.
array_diff_uassoc ( array $array1 , array $array2 , callable $value_compare_func ) : array
array1 : The first array.
array2 : The second array.
value_compare_func : A callback function that compares values in an array.
Suppose we have two APIs returning data, one of which is the old data and the other is the new data. We want to find out which fields have changed. This can be achieved through array_diff_uassoc .
<?php
// Simulate old ones API Return data
$oldData = [
'id' => 1,
'name' => 'John Doe',
'email' => 'john@example.com',
'age' => 30,
'url' => 'https://example.com/profile/1'
];
// Simulate new API Return data
$newData = [
'id' => 1,
'name' => 'John Doe',
'email' => 'john@m66.net',
'age' => 31,
'url' => 'https://m66.net/profile/1'
];
// Custom comparison functions：Is the comparison value equal?
function compareValues($value1, $value2) {
return $value1 === $value2;
}
// Find the field changes
$changedFields = array_diff_uassoc($oldData, $newData, 'compareValues');
// Output changing fields
echo "Change fields：\n";
print_r($changedFields);
?>
Data preparation: Let's assume that there are two APIs that return data $oldData and $newData , which may have changed in some fields.
Comparison function: We define a custom comparison function compareValues to determine whether two values are equal. Return true if the values are equal, otherwise return false .
Call array_diff_uassoc : Use array_diff_uassoc to compare the difference between key-value pairs in $oldData and $newData to find the fields that have changed. array_diff_uassoc will determine whether the field value has changed based on the custom comparison function.
Output result: Output a changing field for further processing.
When you run the above code, you will get the following output:
Change fields：
Array
(
[email] => john@example.com
[age] => 30
[url] => https://example.com/profile/1
)
Field comparison: array_diff_uassoc allows you to not only check the values when comparing arrays, but also determine whether the two values are equal based on the custom comparison function you provide. This is especially useful for complex data structures or when the field content involves floating.
Customization: Customized comparison functions can flexibly deal with different data formats or specific comparison rules. In some scenarios, you may only care about changes in certain fields, array_diff_uassoc makes this more efficient.
Through the array_diff_uassoc function, you can easily find the field changes in the API return data in PHP, especially in scenarios such as data synchronization, debugging, or status monitoring. This method not only helps you identify data differences, but also provides you with the ability to customize comparisons and adapt to complex data structures.
