PHP array bubble sort algorithm example, two-dimensional array algorithm, suffix array doubling algorithm, array deduplication algorithm-PHP Tutorial-php.cn

PHP array bubble sort algorithm example, two-dimensional array algorithm, suffix array doubling algorithm, array deduplication algorithm

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Release： 2016-07-29 08:50:37

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The example in this article describes the PHP array bubble sorting algorithm. Share it with everyone for your reference, the details are as follows:

<&#63;php
/*@冒泡排序算法
*/
$array=array(5,45,22,11,32,28,35,56,17,21,92);
$len=count($array);//计算数组长度
for($i=0;$i<$len-1;$i++){//需要比较$len-1轮，每一轮需要比较$len-1次
  for($j=0;$j<$len-1;$j++){//需要比较$len-1次，因为循环到最后一个数时，后面没有数可以比较了，所以循环到倒数第二个数正好
   $k=$j+1;//得到当前数的后一个数的下标,我们依次比较的是数组下标分别为0-1，1-2，3-4的数值对
   if($array[$j]>$array[$k]){//比较两数，如果前一个数比后一个大，则交换两个数的顺序
     $t=$array[$j];
     $array[$j]=$array[$k];
     $array[$k]=$t;
   }//第一次循环比较完之后，进行下一轮比较
  }
}
print_r($array);
/*理解冒泡排序的关键在于，它的比较结果是大数往后放，依次得出的是最大的数，第二大的数，第三大的数。。。依次类推*/
?>

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