Detailed Example of PHP Bubble Sort Algorithm_PHP Tutorial
When we were in school, our teacher told us that there are many algorithms for sorting program data. In fact, the bubble algorithm is a commonly used sorting algorithm. Now I will use PHP to implement bubble sort, and record it below.
Example 1
The code is as follows | Copy code | ||||
* Bubble sort (one-dimensional array) * Compare the sizes of the data elements to be sorted pairwise. If it is found that the order of the two data elements is reversed, exchange them until there are no reversed data elements * Imagine that the sorted array R[1..N] is erected vertically, and each data element is regarded as a weighted bubble. The array is scanned from bottom to top. Any light bubbles that violate the principle are scanned and made to "float" upward. .Do this over and over again. * Until the end of any two qi, the lighter one is at the top and the heavier one is at the bottom. */ function bubble_sort($arr) { $count = count($arr); If($count = 0 || is_array($arr)) { echo 'NOT NULL ARRAY'; return false; } for($i = 0; $i < $count; $i++) { $flag = 1; for($j = $count - 1; $j > $i; $j--) { If($arr[$j] < $arr[$j - 1]) { $arr[$j] = $array[$j - 1]; $flag = 0; } if (1 == $flag) echo $i,'Complete sorting'; break; } } } return $arr; }<🎜> |
Example 2
The code is as follows
|
Copy code | ||||
//Bubble sort < Selection sort < Insertion sort
$arr = array(-1,10,99,89,77,101,3,4,5,22,11,56,32);
//Bubble sorting method
$flag = false;
function bubbleSort($myarr)
{
$_temp = 0;
for ($i=0;$i
If ($myarr[$j] > $myarr[$j+1])
$_temp = $myarr[$j]; $myarr[$j] = $myarr[$j+1]; $myarr[$j+1] = $_temp; $flag = true;
//flage flag, used to improve efficiency
If (!$flag)
echo "already an ordered array";
break;//It is already an ordered array, exit directly $flag = false; }
Return $myarr;
}
//Output as is
function dump($string)
{
echo "
"; <br> Print_r($string); <br> echo "";
}
dump(bubbleSort($arr));
?>
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