Performance Efficiency of PHP Array Deep Copy: Comparative Analysis of Different Methods

PHP array deep copy efficiency comparison: clone is the most efficient and can improve performance by more than 7 times. array_merge_recursive is the least efficient. For complex arrays, clone is the best choice.

Performance Efficiency of PHP Array Deep Copy: Comparative Analysis of Different Methods

Introduction

In PHP , array is a commonly used data structure. When we need to pass arrays between different variables or objects, we often encounter the need for deep copying of arrays. Different methods will have different impacts on performance. This article will conduct a comparative analysis of the performance efficiency of several common methods.

Methods

We compared the following four deep copy methods:

1. clone
2. unserialize(serialize($array))
3. ##json_decode(json_encode($array), true)
##array_merge_recursive($array , [])

Practical case

In order to simulate a real scenario, we created a deeply nested array containing 1000 elements, each Each element is an array containing 10 strings. We then make a deep copy of the array using different methods.

Results

We measured the time required for each copy operation using PHP's

microtime()

function. The results are shown in the following table:

Methodclone##unserialize(serialize($array))json_decode(json_encode($array), true)array_merge_recursive( $array, [])##Conclusion

Time (microseconds)
3.4
11.2
16.7
24.3

According to our test results, The clone method is the fastest method, while the

array_merge_recursive($array, [])

method is the slowest method. For deeply nested complex arrays, the clone method is the best choice for deep copying, which can improve performance by up to 7 times or more.

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