Detailed explanation of examples of commonly used sorting algorithms in PHP

This article mainly introduces the commonly used sorting algorithms in PHP, and summarizes and analyzes the common sorting algorithms in PHP in the form of examples, including basic sorting, bubble sorting, quick sorting, insertion sorting, etc. Friends who need it can refer to it

phpThree basic algorithms: bubble, insertion and quick sort

$array = array(2,3,5,6,9,8,1);

//冒泡排序思想，前后元素比较
function sort_bulldle($array){
  $num = count($array);
  for($i=0; $i<$num; $i++){
    $tmp = $array[$i];
    for ($j=$i-1; $j>=0; $j--) {
      if ($tmp < $array[$j]) {
        $arr[$j+1] = $arr[$j];
        $arr[$j] = $tmp;
      } else {
        break;
      }
    }
  }
  return $array;
}

//插入排序思想，就是从第二个元素开始，到最后一个元素都是这个需要排序的元素
function sort_bulldle($arr){
  for($i=1, $len=count($arr); $i<$len; $i++) {
    $tmp = $arr[$i];
    for($j=$i-1;$j>=0;$j--) {
      if($tmp < $arr[$j]) {
        $arr[$j+1] = $arr[$j];
        $arr[$j] = $tmp;
      } else {
        break;
      }
    }
  }
  return $arr;
}

//快速排序，找一个基准点把数组分成两组比较
function sort_bulldle($array){
    $num = count($array);
    if($num<=1) {
        return $array;
    }
    $base_num = $array[0];
    $left_array = array();
    $right_array = array();
    for($i=1; $i<$num; $i++) {
        if ($base_num > $array[$i]) {
            $left_array[] = $array[$i];
        }else
        {
            $right_array[] = $array[$i];
        }
    }
    $left_array = sort_bulldle($left_array);
    $right_array = sort_bulldle($right_array);
    return array_merge($left_array, array($base_num), $right_array);
}

The examples in this article summarize the commonly used sorting algorithms in PHP. Share it with everyone for your reference, the details are as follows:

class bevin{
public $public = 'public';
private $private = 'private';
protected $protected = 'protected';
//final $final = 'final';
static $static = 'static';
function __construct(){
 $this->protected = 'change private';
}
public function setValue($a){
 self::$static = $a;
}
public function getValue(){
 echo $this->private;
}
function __destruct(){
 echo 'asdfsadf';
}
}
class paixu {
// 基本排序
public function t_sortArray($array) {
 if(is_array($array) && count($array)>1) {
 for($i=0; $i<count($array); $i++) {
 for($j=($i+1); $j<count($array); $j++) {
 $temp = $array[$i];
 if($array[$j]<$array[$i]) {
 $array[$i] = $array[$j];
 $array[$j] = $temp;
 }
 }
 }
 return $array;
 } else {
 return $array;
 }
}
// 冒泡排序
public function c_sortArray($array) {
 if(!is_array($array) || count($array)<=1){ return $array; }
 $status = false;
 foreach($array as $key=>$v) {
 if($key>0) {
 if($array[$key-1]>$array[$key]) {
 $array[$key] = $array[$key-1];
 $array[$key-1] = $v;
 $status = true;
 }
 }
 }
 if($status) {
 return $this->c_sortArray($array);
 } else {
 return $array;
 }
}
// 快速排序
public function v_sortArray($array) {
 if(!is_array($array) || count($array)<=1){ return $array; }
 if(count($array)>2) {
 $m = $array[floor(count($array)/2)+1];
 } else {
 if($array[0]>$array[1]) {
 $temp = $array[0];
 $array[0] = $array[1];
 $array[1] = $temp;
 }
 return $array;
 }
 $leftarray = array();
 $rightarray = array();
 foreach($array as $key=>$v) {
 if($v>$m) {
 $rightarray[] = $v;
 }
 if($v<$m) {
 $leftarray[] = $v;
 }
 if($v==$m) {
 $mid[] = $v;
 }
 }
 $nleftarray = $this->v_sortArray($leftarray);
 $nrightarray = $this->v_sortArray($rightarray);
 return array_merge($nleftarray,$mid,$nrightarray);
}
// 直接插入排序
public function i_sortArray($array) {
 if(!is_array($array) || count($array)<=1){ return $array; }
 $newarray = array($array[0]);
 $temp = 0;
 foreach($array as $k=>$v) {
 if($k>0) {
 if($v>=$newarray[count($newarray)-1]) {
 $newarray[] = $v;
 } else {
 foreach($newarray as $nk=>$nv) {
 if($v<$nv) {
 $temparray = array();
 foreach($newarray as $ck=>$cv) {
  if($ck<$nk) {
  $temparray[$ck] = $cv;
  } elseif($ck==$nk) {
  $temparray[$ck] = $v;
  $temparray[($ck+1)] = $cv;
  } else {
  $temparray[($ck+1)] = $cv;
  }
 }
 $newarray = $temparray;
 break;
 }
 }
 }
 }
 }
 return $newarray;
}
}
$bevin = new paixu;
$array = array(5,4,5,4,4,5,5,5,5,5);
$v = $bevin->t_sortArray($array);
print_r($v);
$v = $bevin->c_sortArray($array);
print_r($v);
$v = $bevin->v_sortArray($array);
print_r($v);
$v = $bevin->i_sortArray($array);
print_r($v);

Running results:

Array
(
 [0] => 4
 [1] => 4
 [2] => 4
 [3] => 5
 [4] => 5
 [5] => 5
 [6] => 5
 [7] => 5
 [8] => 5
 [9] => 5
)
Array
(
 [0] => 4
 [1] => 4
 [2] => 4
 [3] => 5
 [4] => 5
 [5] => 5
 [6] => 5
 [7] => 5
 [8] => 5
 [9] => 5
)
Array
(
 [0] => 4
 [1] => 4
 [2] => 4
 [3] => 5
 [4] => 5
 [5] => 5
 [6] => 5
 [7] => 5
 [8] => 5
 [9] => 5
)
Array
(
 [0] => 4
 [1] => 4
 [2] => 4
 [3] => 5
 [4] => 5
 [5] => 5
 [6] => 5
 [7] => 5
 [8] => 5
 [9] => 5
)

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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