PHP algorithm sorting encyclopedia, a must-read algorithm for interviews

1.冒泡排序

function sort($array) {

    $length=count($array);

    for ($i=$length;$i>0;$i--){

        $swape=true;

        for ($j=0;$j<$i-1;$j ){

            if ($array[$j]>$array[$j 1]){

                $temp=$array[$j];

                $array[$j]=$array[$j 1];

                $array[$j 1]=$temp;

                $swape=false;

            }

        }

        if ($swape)break;

    }

    return $array;

}

2.气泡排序

function sort($input)

{

    

    if(!isset($input))

    {

        return [];

    }

    do

    {

        $swapped = false;

        for($i = 0, $count = sizeof($input) - 1; $i < $count; $i )

        {

            if($input[$i 1] < $input[$i])

            {

                list($input[$i 1], $input[$i]) = [$input[$i], $input[$i 1]];

                $swapped = true;

            }

        }

    }

    while($swapped);

    return $input;

}

$array = [51158,1856,8459,67957,59748,58213,90876,39621,66570,64204,79935,27892,47615,94706,34201,74474,63968,4337,43688,42685,31577,5239,25385,56301,94083,23232,67025,44044,74813,34671,90235,65764,49709,12440,21165,20620,38265,12973,25236,93144,13720,4204,77026,42348,19756,97222,78828,73437,48208,69858,19713,29411,49809,66174,52526277,7515,7873,8350,28229,24105,76818,86897,18456,29373,7853,24932,93070,4696,63015,9358,28302,3938,11754,33679,18492,91503,63395,12029,23954,27230,58336,16544,23606,61349,37348,78629,96145,57954,32392,76201,54616,59992,5676,97799,47910,98758,75043,72849,6466,68831,2246,69091,22296,6506,93729,86968,39583,46186,96782,19074,46574,46704,99211,55295,33963,77977,86805,72686];

$array = sort($array);

echo implode(',', $array);

3.计数排序

function sort($array, $min, $max)

{

    $count = array();

    for($i = $min; $i <= $max; $i )

    {

        $count[$i] = 0;

    }

    foreach($array as $number)

    {

        $count[$number] ;

    }

    $z = 0;

    for($i = $min; $i <= $max; $i ) {

        while( $count[$i]-- > 0 ) {

            $array[$z ] = $i;

        }

    }

    return $array;

}

4.插入排序

function sort($array){

    for ($i=1;$i

        $currentVal=$array[$i];

        for ($j=$i-1;$j>=0&&$array[$j]>$currentVal;$j--){

          $array[$j 1]=$array[$j];

        }

        $array[$j 1]=$currentVal;

    }

    return $array;

}

5.快速排序

function sort($input)

{

   

    if(!isset($input))

    {

        return [];

    }

    $lt = [];

    $gt = [];

    if(sizeof($input) < 2)

    {

        return $input;

    }

    $key = key($input);

    $shift = array_shift($input);

    foreach($input as $value)

    {

        $value <= $shift ? $lt[] = $value : $gt[] = $value;

    }

    return array_merge(quickSort($lt), [$key => $shift], quickSort($gt));

}

$array = [51158,1856,8459,67957,59748,58213,90876,39621,66570,64204,79935,27892,47615,94706,34201,74474,63968,4337,43688,42685,31577,5239,25385,56301,94083,23232,67025,44044,74813,34671,90235,65764,49709,12440,21165,20620,38265,12973,25236,93144,13720,4204,77026,42348,19756,97222,78828,73437,48208,69858,19713,29411,49809,3015,9358,28302,3938,11754,33679,18492,91503,63395,12029,23954,27230,58336,16544,23606,61349,37348,78629,96145,57954,32392,76201,54616,59992,5676,97799,47910,98758,75043,72849,6466,68831,2246,69091,22296,6506,93729,86968,39583,46186,96782,19074,46574,46704,99211,55295,33963,77977,86805,72686];

$array = quickSort($array);

echo implode(',', $array);

6.选择排序

function sort($array){

    $length=count($array);

    for ($i=0;$i<$length;$i ){

        $lowest=$i;

        for ($j=$i 1;$j<$length;$j ){

            if ($array[$j] < $array[$lowest]){

                $lowest=$j;

            }

        }

        if ($i !==$lowest){

            $temp=$array[$i];

            $array[$i]=$array[$lowest];

            $array[$lowest]=$temp;

        }

    }

    return $array;

}

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原文链接：https://blog.csdn.net/m0_37540251/article/details/125201836

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