php foreach 循环遍历求总分平均分

在PHP中，`foreach`循环通常用于遍历数组，并可以用于计算总分和平均分。假设我们有一个包含学生成绩的关联数组，例如：

$students = array(
    '张三' => 90,
    '李四' => 85,
    '王五' => 95,
    '赵六' => 80
);

首先，我们可以使用`foreach`循环遍历这个数组，累加所有学生的分数到 `$total_score` 变量，同时记录学生数量到 `$count` 变量：

$total_score = 0;
$count = count($students);

foreach ($students as $name => $score) {
    $total_score += $score;
}

接着，计算平均分，只需将 `total_score` 除以 `$count`：

$average_score = $total_score / $count;

完整代码示例：

$students = array(
    '张三' => 90,
    '李四' => 85,
    '王五' => 95,
    '赵六' => 80
);

$total_score = 0;
$count = count($students);

foreach ($students as $name => $score) {
    $total_score += $score;
}

$average_score = $total_score / $count;

echo "总分：$total_score<br>";
echo "平均分：$average_score";