PHP Array Key Value Replacement: Performance Comparison and Best Practices

The best way to replace array key values ​​is to use the array_flip() function because it is nearly twice as fast as array_combine() and array_keys().

PHP Array Key Value Replacement: Performance Comparison and Best Practices

Array Key Value Replacement is a modification in PHP Array associated key method, it can be implemented in the following two ways:

1. Use array_flip() Function
2. Use array_combine() Function and array_keys() Function

Performance comparison

The following benchmarks compare the performance of these two methods:

Benchmark code:

$array = range('a', 'z');
$keys = array_keys($array);

// 使用 array_flip()
$start = microtime(true);
$flipped = array_flip($array);
$time_flip = microtime(true) - $start;

// 使用 array_combine() 和 array_keys()
$start = microtime(true);
$combined = array_combine($keys, $array);
$time_combine = microtime(true) - $start;

Result:

##MethodTime (microseconds)##array_flip()array_combine()

2.96
and array_keys()5.58

array_flip()

Nearly twice as fast as array_combine() and array_keys().

Best Practice

Based on performance comparison, it is the best practice to use the

array_flip()

function for array key value replacement. Here are some additional best practices for array key-value substitution:

Make sure the array contains unique keys.

• Before flipping key-value relationships, consider using the
array_unique()
• function to remove duplicate keys. For large arrays, using the
array_flip()
• function may result in higher memory consumption. Consider using custom functions or third-party libraries for optimization.

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