Question

我有两个数组，第一个是学生姓名，第二个是他最喜欢的作者选择，如下所示

$ student array如下

 array (size=3)
      0 => string 'Jane' (length=4)
      1 => string 'Michelle' (length=8)
      2 => string 'Mark' (length=4)

现在第二个数组作者$选择如下：

array (size=3)
  0 => 
    array (size=3)
      0 => string 'Mark Twaine' (length=11)
      1 => string 'E A Poe' (length=7)
      2 => string 'James Joyce' (length=11)
  1 => 
    array (size=3)
      0 => string 'Oscar' (length=11)
      1 => string 'Leo Toby' (length=7)
      2 => string 'James Joyce' (length=11)
  2 => 
    array (size=3)
      0 => string 'Leo Toby' (length=11)
      1 => string 'E A Poe' (length=7)
      2 => string 'James Joyce' (length=11)

现在我想展示学生的名字和他最喜欢的作者，即Jane最喜欢的作者是Mark Twaine，EA Poe，James Joyce和Michelle最喜欢的作者是Oscar，Leo Toby，James Joyce和Mark最喜欢的作者是Leo Toby，EA坡，詹姆斯乔伊斯......

到目前为止我已尝试过这个

foreach( $student as $key => $val  ) {
    echo $val." read ";
    foreach( $selection as $key1 ) {
        foreach ($key1 as $key2 => $val2){

        echo $val2;
        echo ' and ';
    } 
       echo "<br/>"; 
}

并将其作为输出

Jane favorite is Mark Twaine and E A Poe and James Joyce and 
Oscar and Leo Toby and James Joyce and 
Leo Toby and E A Poe and James Joyce and 
Michelle favorite is Mark Twaine and E A Poe and James Joyce and 
Oscar and Leo Toby and James Joyce and 
Leo Toby and E A Poe and James Joyce and  
Mark favorite is Mark Twaine and E A Poe and James Joyce and 
Oscar and Leo Toby and James Joyce and 
Leo Toby and E A Poe and James Joyce and

而不是

    Jane favorite is Mark Twaine and E A Poe and James Joyce
    Michelle favorite is Oscar and Leo Toby  and James Joyce
    Mark favorite is Leo Toby and E A Poe and James Joyce

我希望foreach循环只使用递增键

限制为一个单个数组值

Answer 1

您可以使用array_combine()来结合学生和选择。然后，使用implode()来回应每个学生的选择：

$student = ['Jane','Michelle','Mark'];
$selection = [
  ['Mark Twaine', 'E A Poe', 'James Joyce'],
  ['Oscar', 'Leo Toby', 'James Joyce'],
  ['Leo Toby', 'E A Poe', 'James Joyce'],
];

$comb = array_combine($student, $selection);

foreach ($comb as $student => $item) {
  echo $student . ' favorite is '. implode(' and ', $item). '<br>' ;
}

输出：

Jane favorite is Mark Twaine and E A Poe and James Joyce
Michelle favorite is Oscar and Leo Toby and James Joyce
Mark favorite is Leo Toby and E A Poe and James Joyce

Answer 2

问题在于，您的第二个foreach()（foreach( $selection as $key1 ) {）正在循环覆盖每个学生的所有选择。此时，您需要选择相应学生的选择（将$ student数组的键与$ selection数组中的一个匹配）。

$student = ['Jane', 'Michelle', 'Mark'];
$selection = [['Mark Twaine','E A Poe','James Joyce'],
    ['Oscar','Leo Toby','James Joyce'],
    ['Leo Toby','E A Poe','James Joyce']];

foreach( $student as $key => $val  ) {
    echo $val." read ";
    foreach( $selection[$key] as $val2 ) {
            echo $val2;
            echo ' and ';
    }
    echo "<br/>";
}

您可以看到内部foreach使用第一个数组中的$key来选择要循环的选项。

您可以使用implode()缩短内部循环，这也可以消除输出中的额外“和”。

foreach( $student as $key => $val  ) {
    echo $val." read ".implode(' and ', $selection[$key])."<br/>";
}

使用递增键打印多维数组

2 个答案: