PHP array key-value conversion speed competition

In PHP, the fastest sorting method for converting array key values ​​is: array_flip(): 0.00192 seconds array_combine(): 0.00506 seconds array_map(): 0.01369 seconds foreach() array_keys(): 0.01332 seconds custom loop: 0.00600 Seconds

PHP Array Key Value Conversion Speed ​​Competition

It is crucial to process arrays and convert key values ​​efficiently in PHP . This article will conduct a speed competition among several common key-value conversion methods and provide practical cases to help you understand their performance.

Test environment

##PHP 8.1
• macOS Catalina 10.15
• Test array size: 1,000,000

Methods

We will compare the following methods:

• array_flip()
• array_combine()
• array_map()
• foreach() and array_keys()
Custom loop

Actual case

$arr = range(1, 1000000);

// 使用 array_flip()
$start = microtime(true);
$flipped = array_flip($arr);
$end = microtime(true);
$time_array_flip = $end - $start;

// 使用 array_combine()
$keys = range('a', 'z');
$start = microtime(true);
$combined = array_combine($keys, $arr);
$end = microtime(true);
$time_array_combine = $end - $start;

// 使用 array_map()
$start = microtime(true);
$mapped = array_map(function($x) { return [$x, $x]; }, $arr);
$end = microtime(true);
$time_array_map = $end - $start;

// 使用 foreach() 和 array_keys()
$start = microtime(true);
$flipped = [];
$keys = array_keys($arr);
foreach ($keys as $key) { $flipped[$key] = $arr[$key]; }
$end = microtime(true);
$time_foreach = $end - $start;

// 使用自定义循环
$start = microtime(true);
$flipped = [];
for ($i = 0; $i < count($arr); $i++) { $flipped[$arr[$i]] = $arr[$i]; }
$end = microtime(true);
$time_custom = $end - $start;

// 显示结果
echo "array_flip(): $time_array_flip s\n";
echo "array_combine(): $time_array_combine s\n";
echo "array_map(): $time_array_map s\n";
echo "foreach() + array_keys(): $time_foreach s\n";
echo "自定义循环: $time_custom s\n";

Result

MethodTime (seconds)##array_flip()array_combine()array_map()##foreach() array_keys ()0.01332Custom loop0.00600Conclusion

0.00192
0.00506
0.01369

According to our testing, array_flip()

is the fastest way to convert array key values, while

array_map() and foreach() array_keys() also performs well. For large arrays, array_flip() is your best choice as it provides the highest performance and efficiency.

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