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PHP array key value flipping: Comparative performance analysis of different methods
PHP array key value flipping: Comparative performance analysis of different methods
May 03, 2024 pm 09:03 PM
The performance comparison of PHP array key value flipping methods shows that the array_flip() function performs better than the for loop in large arrays (more than 1 million elements) and takes less time. The for loop method of manually flipping key values ??takes a relatively long time.
PHP Array Key Value Flip: Comparative Performance Analysis of Different Methods
Introduction
In PHP, array key value flipping is a common operation. It swaps the keys and values ??in an array to form a new array. This article will compare the performance of different array key value flipping methods and provide practical cases.
Method comparison
array_flip() function
array_flip() The function is built-in in PHP Array key value flip function. Its syntax is very simple:
array_flip($array);
For loop
You can also use the for loop to manually flip the key values ????of the array:
$newArray = [];
foreach ($array as $key => $value) {
$newArray[$value] = $key;
}Practical combat Case
The following is a practical case that compares the performance of the array_flip() function and the for loop method:
$array = range(1, 1000000); // 創(chuàng)建一個(gè)包含 100 萬個(gè)元素的數(shù)組
// 使用 array_flip() 函數(shù)翻轉(zhuǎn)鍵值
$startTime = microtime(true);
$flippedArray1 = array_flip($array);
$endTime = microtime(true);
$time1 = $endTime - $startTime;
// 使用 for 循環(huán)翻轉(zhuǎn)鍵值
$startTime = microtime(true);
$flippedArray2 = [];
foreach ($array as $key => $value) {
$flippedArray2[$value] = $key;
}
$endTime = microtime(true);
$time2 = $endTime - $startTime;
echo "array_flip() 函數(shù)耗時(shí)：$time1 秒<br>";
echo "for 循環(huán)耗時(shí)：$time2 秒<br>";
if ($flippedArray1 == $flippedArray2) {
echo "兩個(gè)數(shù)組相等<br>";
}Result
In the test environment (PHP 8.2):
- ##array_flip()
The function takes: 0.0021 secondsfor loop The time taken is: 0.0052 seconds
array_flip() function performs better than the for loop.
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