泡沫排序沒有每個PHP

Question

嗨，我似乎無法使它正常工作，並且在第8行和第11行中不斷出現未定義的錯誤。這是我的代碼

<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . "<p>";
for ($incount = 0; $incount <= 7; $incount++) {
    if ($name[$incount] > $name[$incount + 1]) {
        $temp = $name[$incount];
        $name[$incount] = $name[$incount + 1];
        $name[$incount + 1] = $temp;
        echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . $count++ . "<p>";
    }
}
?>

Answer 1

這是錯誤的：

$name[$incount] > $name[$incount + 1]

當$incount = 7 $incount +1 = 8這對於您來說是未定義的...因為您僅定義了7個元素...

解決方案可以只是$incount < 7

Answer 2

您沒有使用正確的算法進行冒泡排序。 它需要兩個循環。

<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . "<p>";
for ($incount = 0; $incount <= 7; $incount++) {
    for ($innercount = $incount+1; $innercount <= 7; $innercount++) {
        if ($name[$incount] > $name[$innercount]) {
            $temp = $name[$incount];
            $name[$incount] = $name[$innercount];
            $name[$innercount] = $temp;
            echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . $count++ . "<p>";
        }
    }
}
?>

Answer 3

<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . "<p>";
for ($incount = 0; $incount < 8; $incount++) {
    if(isset($name[$incount + 1]))
    if ($name[$incount] > $name[$incount + 1]) {
        $temp = $name[$incount];
        $name[$incount] = $name[$incount + 1];
        $name[$incount + 1] = $temp;}
        echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . $count++ . "<p>";

}
?>

但是更好的使用

<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
foreach($name as $f) echo $f." ";
echo "<p>";
for ($incount = 0; $incount < 8; $incount++) {
    if(isset($name[$incount + 1]))
    if ($name[$incount] > $name[$incount + 1]) {
        $temp = $name[$incount];
        $name[$incount] = $name[$incount + 1];
        $name[$incount + 1] = $temp;}
        foreach($name as $f) echo $f." ";
        echo  $count++ . "<p>";
}
?>