PHP writing bubble sort PHP array bubble sort PHP bubble sort principle PHP is optimal for bubble sort

<?php
function getRandArr(){
	$num = mt_rand(10,11);
	$arr = array();
	for($i = 0;$i < $num;$i++){
		$arr[$i] = mt_rand(100,100000);
	}

	return $arr;
}

//冒泡排序
function bubbleSort($arr,$asc = TRUE){
	$last_key = count($arr) - 1;

	if($asc == TRUE){
		//升序
		for($i = 0;$i <= $last_key;$i++){

			//获取已经排序号的key
			$sort_key = $last_key - $i;

			for($j = 0;$j < $sort_key;$j++){
				if($arr[$j] > $arr[($j + 1)]){
					//下一个大于上一个
					$temp = $arr[($j + 1)];
					$arr[($j + 1)] = $arr[$j];
					$arr[$j] = $temp;
				}
			}
		}
	}else{
		//降序
		for($i = $last_key;$i >= 0;$i--){
			
			//获取已经排序好的key
			$sort_key = $last_key - $i;

			for($j = $last_key;$j > $sort_key;$j--){
				if($arr[$j] > $arr[($j - 1)]){
					//下一个大于上一个
					$temp = $arr[($j - 1)];
					$arr[($j - 1)] = $arr[$j];
					$arr[$j] = $temp;
				}
			}
		}
	}

	return $arr;
}

$sort_arr = getRandArr();
var_dump(bubbleSort($sort_arr));

The above introduces how to write bubble sort in PHP, including bubble sort and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.