PHP兑现常见排序算法

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Release: 2016-06-13 10:31:28
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PHP实现常见排序算法


//插入排序(一维数组)
function insert_sort($arr){
?$count = count($arr);
?for($i=1; $i?$tmp = $arr[$i];
?$j = $i - 1;
?while($arr[$j] > $tmp){
?$arr[$j+1] = $arr[$j];
?$arr[$j] = $tmp;
?$j--;
?}
?}
?return $arr;
}
//选择排序(一维数组)
function select_sort($arr){
?$count = count($arr);
?for($i=0; $i?$k = $i;
?for($j=$i+1; $j?if ($arr[$k] > $arr[$j])
?$k = $j;
?if ($k != $i){
?$tmp = $arr[$i];
?$arr[$i] = $arr[$k];
?$arr[$k] = $tmp;
?}
?}
?}
?return $arr;
}
//冒泡排序(一维数组)
function bubble_sort($array){
?$count = count($array);
?if ($count ?
?for($i=0; $i?for($j=$count-1; $j>$i; $j--){
?if ($array[$j] ?$tmp = $array[$j];
?$array[$j] = $array[$j-1];
?$array[$j-1] = $tmp;
?}
?}
?}
?return $array;
}
//快速排序(一维数组)
function quick_sort($array){
?if (count($array)

?$key = $array[0];
?$left_arr = array();
?$right_arr = array();
?for ($i=1; $i?if ($array[$i] ?$left_arr[] = $array[$i];
?else
?$right_arr[] = $array[$i];
?}
?$left_arr = quick_sort($left_arr);
?$right_arr = quick_sort($right_arr);
?
?return array_merge($left_arr, array($key), $right_arr);

}
?>

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