Question

以下是我的代码打印：

 Even numbers: 2 4 6

这是我的PHP代码：

$names = file('file.txt');
echo "Text: ";
foreach($names as $name)
{
echo $name . "</br>";
}
echo "Even numbers: ";
foreach ($names as $name) {

$name = count_chars( $name, 3);
for($i=0; $i<strlen($name);$i++) {
    if (is_numeric($name[$i]) && $name[$i]%2==0)
    { 
echo $name[$i];
    }
    }
echo "<br>";
}
?>

有人能告诉我如何将所有这些值计入新行（我需要得到答案3）并获得这些值总和（我需要得到12）？我知道我必须使用计数和求和函数，我不确切知道在哪里。谢谢你的帮助。所有答案应如下所示：

Even numbers: 2 4 6
Even numbers are: 3
Even numbers sum are: 2 + 4 + 6 = 12

Answer 1

试试这个：

$names = file('file.txt');
echo "Text: ";
foreach($names as $name)
{
echo $name . "</br>";
}
echo "Even numbers: ";
foreach ($names as $name) { 
$count = 0
$evens = [];
$name = count_chars($name, 3);
for($i=0; $i<strlen($name);$i++) {
    if (is_numeric($name[$i]) && $name[$i]%2==0)
    { 
     $count++;
     $evens[] = $name[$i];
     echo $name[$i];
    }
    }
echo "<br>";
}


echo "Even numbers Are: " . $count;
$i=0;
foreach($evens as $e){ 
   $i++;
   if($i == count($evens)){
     $evens_string .=  $e . '=' ;
   } else {
     $evens_string .= $e . '+' ;
   }
}

$even_string .= array_sum($evens);

echo "Even numbers sum are: " . $even_string;

希望这会给你一个想法！我还没有测试过代码。

Answer 2

我真的不明白你的问题。但我认为array_sum正是你要找的。（https://secure.php.net/manual/en/function.array-sum.php）

以下是我的代码供您参考：

$array = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

foreach($array as $key => $value) {
    if (empty($value%2)) {
        $even[] = $value;
    } else {
        $odd[] = $value;
    }
}

echo 'Even numbers: '.implode(' ', $even).'<br>';
echo 'Odd numbers: '.implode(' ', $odd).'<br>';
echo 'Even numbers sum are: '.implode(' + ', $even).' = '.array_sum($even);

插入计数和求和函数

2 个答案: