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php基本排序

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Release: 2016-05-26 08:19:11
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<?php
//参考这个网站的伪代码编写的
//http://www.php.cn/

$unsortList = [3, 44, 38, 5, 47, 15, 36, 26, 27, 2];

// 冒泡排序
function bubbleSort($arr) {
	do {
		$swapped = false;
		for ($i = 1; $i < count($arr); $i++) {
			if ($arr[$i-1] > $arr[$i]) {
				$temp = $arr[$i-1];
				$arr[$i-1] = $arr[$i];
				$arr[$i] = $temp;
				$swapped = true;
			}
		}
	} while ($swapped);
	return $arr;	
}

// 选择排序
function selectSort($arr) {
	$minimumPosition = 0;
	$len = count($arr);
	for ($i = 0; $i < $len - 1; $i++) {		
		for ($j = $i + 1; $j < $len - $i; $j++) {
			if ($arr[$j] < $arr[$minimumPosition]) {
				$minimumPosition = $j;
			}
		}
		$temp = $arr[$i];
		$arr[$i] = $arr[$minimumPosition];
		$arr[$minimumPosition] = $temp;
	}
	return $arr;
}

// 插入排序
function insertSort1($arr) {
	$len = count($arr);		
	for ($i = 1; $i < $len; $i++) {
		$extractElement = $arr[$i];		
		for ($j = $i - 1; $j >= 0; $j--) {
			if ($arr[$j] > $extractElement) {
				$arr[$j+1] = $arr[$j];												
				$arr[$j] = $extractElement;
			}
		}			
	}
	return $arr;
}
/**
 * 插入排序
 * @param Array $a 无序集合
 * @return Array 有序集合
 */
function insertSort2($a) {
	$temp;
	$i;
	$j;
	$size_a = count($a);
	# 从第二个元素开始
	for ($i = 1; $i < $size_a; $i++) {			
		if ($a[$i] < $a[$i-1]) {			
			$j = $i; # 保存当前元素的位置
			$temp = $a[$i];	 # 当前元素的值	

			# 比较左边的元素,如果找到比自己更小的,向右移动元素,否则插入元素到当前位置
			while($j>0 && $temp<$a[$j-1]) {
			 	$a[$j] = $a[$j-1];
			 	$j--;
			}
			
			# 插入元素
			$a[$j] = $temp;
		}
	}
	return $a;
}

/**
 * 获取随机数
 * @param Integer $size 数量
 * @return Integer
 */
function randomNumber($size = 10) {
	$rand = array();
	srand(time(NULL));
	for ($i = 0; $i < $size; $i++) {
		array_push($rand, mt_rand(0,1000));		
	}
	return $rand;
}

//print_r(implode(",", bubbleSort($unsortList)));
//print_r(implode(",", selectSort($unsortList)));
//print_r(implode(",", insertSort1($unsortList)));
//print_r(implode(",", insertSort2($unsortList)));
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