PHP 数组排序

插入排序：

<?php
$x = array(5,3,4,9,10,22,1,-2,4); 
echo "排序前数组：" . PHP_EOL;
print_r($x);
function SortInsert(array $arr)
{
    for($i=0;$i<count($arr)-1;$i++)
        for($j=$i+1;$j<count($arr);$j++)
        {
            if($arr[$j]<$arr[$i])
            {
                $temp=$arr[$j];
                $arr[$j]=$arr[$i];
                $arr[$i]=$temp;
            }
        }
    return $arr;
}

echo "排序后数组：" . PHP_EOL;
$x=SortInsert($x);
print_r($x);
?>

写两个冒泡排序:

<?php
//升序
$myArray=array(10,11,9,12,8);
for ($i=0;$i<count($myArray)-1;$i++){
    for ($j=0;$j<count($myArray)-$i-1;$j++){
            if($myArray[$j]>$myArray[$j+1]){
            //把大的往后移
            $temp=$myArray[$j];
            $myArray[$j]=$myArray[$j+1];
            $myArray[$j+1]=$temp;
        }
    }
}
print_r($myArray);
echo "<br>";
//降序
$myArray2=array(11,12,13,9,14,15);
for ($i=0;$i<count($myArray2)-1;$i++){
    for ($j=0;$j<count($myArray2)-$i-1;$j++){
        if ($myArray2[$j]<$myArray2[$j+1]){
            //把小的数往后移
            $temp=$myArray2[$j];
            $myArray2[$j]=$myArray2[$j+1];
            $myArray2[$j+1]=$temp;
        }
    }
}
print_r($myArray2);
?>

<?php
// 从大到小排序
$numArray =array(3,2,6,5,8,10);
$numCount = count($numArray);
for($i=$numCount-1;$i>=0;$i--){
    for($j=0;$j<$i;$j++){
        if($numArray[$j]< $numArray[$j+1]){
            $aa = $numArray[$j+1];
            $numArray[$j+1]=$numArray[$j];
            $numArray[$j]=$aa;
        }
    }
}

print_r($numArray);
?>