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php实例代码:各种排序的算法

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2016-06-13 09:28:321028browse

php实例代码:各种排序的算法

  

  //冒泡排序

  function maopao_sort($demo){

  $num = count($demo);

  for($i=0;$i

  for($j=$num-1;$j>$i;$j--){

  if($demo[$j]

  $temp = $demo[$j];

  $demo[$j]=$demo[$j-1];

  $demo[$j-1]= $temp;

  }

  }

  }

  return $demo;

  }

  //插入排序

  function charu_sort($demo){

  $num = count($demo);

  for($i=1;$i

  $temp=$demo[$i];

  $dqweizhi = $i-1;//记录当前位置

  while(($dqweizhi>=0)&&($temp

  $demo[$dqweizhi+1] = $demo[$dqweizhi];

  $dqweizhi--;

  }

  $demo[$dqweizhi+1] = $temp;

  }

  return $demo;

  }

  //选择法排序

  function select_sort($demo){

  $num = count($demo);

  for($i=0;$i

  $temp=$demo[$i];

  $dqweizhi=$i;

  for($j=$i+1;$j

  if($demo[$j]

  $temp=$demo[$j];

  $dqweizhi=$j;

  }

  }

  $demo[$dqweizhi]=$demo[$i];

  $demo[$i]=$temp;

  }

  return $demo;

  }

  //快速排序

  function quick_sort($demo)

  {

  $num = count($demo);

  if($num

  return $demo;

  }

  $key=$demo[0];

  $left_array=array();

  $right_array=array();

  for($i=1;$i

  if($demo[$i]

  $left_array[]=$demo[$i];

  }else{

  $right_array[]=$demo[$i];

  }

  }

  $left_array =quick_sort($left_array);

  $right_array=quick_sort($right_array);

  return array_merge($left_array,array($key),$right_array);

  }

  $test = array('43','154','3','78','13','284','167','2','56','2234','121','57','345');

  $sss = quick_sort($test);

  var_dump($sss);

  ?>

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