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English
In PHP, array_diff_uassoc() is a very useful function that can be used to compare keys and values of two arrays and return the differences in the two arrays. We can use this function to implement a simple array version control function that tracks the changes in arrays between different versions, especially when the keys and values of the array need to be considered at the same time.
The array_diff_uassoc() function is used to compare two arrays and returns an array containing key-value pairs in the first array but not in the second array. Unlike other comparison functions, it allows you to provide a custom callback function to compare keys to arrays.
array_diff_uassoc(array $array1, array $array2, callable $key_compare_func): array
$array1 : The first array.
$array2 : The second array.
$key_compare_func : The callback function that compares array keys should return an integer value to determine the relationship between two keys.
Versioning usually requires recording the differences in each version. We can use the array_diff_uassoc() function to find out the changes in arrays between different versions. For example, suppose we have an array that records properties of different versions of a product, and we want to be able to view the differences between different versions.
Suppose we have two versions of the product attribute array, version 1 and version 2. Version 1 contains basic information about the product, while Version 2 contains some updated properties and deleted items. We want to find out these differences for version management.
<?php
// Version1：Initial product attribute array
$version1 = [
'name' => 'productA',
'price' => 100,
'color' => 'red',
'size' => 'M'
];
// Version2：更新后的product属性数组
$version2 = [
'name' => 'productA',
'price' => 120, // Price update
'color' => 'blue', // Color update
'material' => 'cotton' // Added attributes
];
// 比较Version1和Version2The difference
$diff = array_diff_uassoc($version2, $version1, function($key1, $key2) {
return strcmp($key1, $key2); // Comparison key
});
echo "<pre>";
print_r($diff); // 输出Version2Newly added or modified parts
echo "</pre>";
?>
Version 1 and Version 2 are two different versions of product attribute arrays.
array_diff_uassoc() is used to compare the keys and values of two arrays. We pass a custom key comparison function strcmp to compare the dictionary order of keys.
Through this function, we can obtain new or modified properties (such as price and color ) in version 2, which are the "differences" of our version control.
Array
(
[price] => 120
[color] => blue
[material] => cotton
)
In this result, array_diff_uassoc() returns the newly added or modified properties in version 2. In this way, we can use this method to track the changes of arrays between different versions, thereby achieving simple version control of arrays.
The array_diff_uassoc() function is a very powerful tool in the version control of arrays. Through the custom key comparison method, we can accurately control the comparison method to meet various version control needs. For more complex version management, more complex logic can be implemented in combination with other PHP functions, but this has provided us with a good starting point.
