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Best Practices for Deep Copying PHP Arrays: Discover Efficient Methods
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The best practice for performing an array deep copy in PHP is to use json_decode(json_encode($arr)) to convert the array to a JSON string and then convert it back to an array. Use unserialize(serialize($arr)) to serialize the array to a string and then deserialize it to a new array. Use the RecursiveIteratorIterator to recursively traverse multidimensional arrays.
Best practices for deep copying PHP arrays: exploring efficient methods
In PHP, arrays are a widely used Commonly used data structures for storing and processing data. In some cases, you may want to create a copy of an array so that you can operate on the copy without affecting the original array. This is called a deep copy.
Why choose deep copy?
One of the main benefits of deep copying is that it ensures that the original array and the copy are independent of each other. Modifications made to the copy do not affect the original array. This is useful in situations such as caching and concurrency scenarios.
Deep copy method
In PHP, there are several ways to perform deep copy:
- ##json_decode(json_encode( $arr));: Use json_encode()
to convert the array to a JSON string, and then usejson_decode()to convert it to a new array. - unserialize(serialize($arr));: Serialize the array into a string, then use unserialize()
to deserialize it into a new array. - RecursiveIteratorIterator: This is an SPL iterator that supports recursive traversal of multidimensional arrays.
Real Case
Consider the following example:$original_array = ['name' => 'John', 'age' => 30, 'scores' => [95, 85, 90]]; // 使用 json_decode() 进行深度复制 $copied_array = json_decode(json_encode($original_array), true); // 修改副本 $copied_array['name'] = 'Jane'; // 输出原始和复制的数组 echo '原始数组：'; var_dump($original_array); echo '复制的数组：'; var_dump($copied_array);In the above example,
json_encode() will The original array is converted to a JSON string, json_decode() converts it to a new array. Then, the copied array is modified without affecting the original array.
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