Question

我有简单的嵌套foreach()，但我没有得到我想的那样。

这是完整的代码：

public function namelist() {
      return array('lastname', 'firstname', 'middlename');
}

public function nameRequest($namelist) { // either lastname, firstname or middlename
      switch($namelist) {
            case 'lastname':
                $request = array('ramirez', 'corazon', 'gonzaga');
            break;
            case 'firstname':
                $request = array('michael', 'michaela', 'angel');
            break;
            case 'middlename':
                $request = array('osaka', 'oscar', 'roxas');
            break;
      }
   return $request;
}

我想要一个这样的结果：

Lastname: ramirez, corazon, gonzaga
Firstname: michael, michaela, angel
Middlename: osaka, oscar, roxas

但是当我尝试像这样编码时：

public function fullname() {
      $namelist = '';
      $namedata = '';
      $namelists = self::namelist();

      foreach ($namelists as $names) {
             $namelist .= $names . ': ';
             $namerequest = self::nameRequest($names);

             foreach ($namerequest as $namerequests){
                    $namedata .= $namerequests . ',';
             }
      }
      return $namelist . ': ' . $namedata; 
}

它返回：

lastname: firstname: middlename: ramirez, corazon, gonzaga, michael, michaela, angel, osaka, oscar, roxas

那我怎么解决这个问题呢？

Answer 1

如果更新循环，这会更有意义：

 public function fullname() {
          $namelist = '';
          $namedata = '';
          $namelists = self::namelist();
          $temp = '';

          foreach ($namelists as $names) {
                 $namerequest = self::nameRequest($names);

                 foreach ($namerequest as $namerequests){
                        $namedata .= $namerequests . ',';
                 }

                 $temp .= $names . ': ' . $namedata.'<br/>';
          }
          return $temp; 
    }

Answer 2

有一些错位的陈述：

<pre>
<?php
function namelist() {
    return array('lastname', 'firstname', 'middlename');
}
function nameRequest($namelist) { // either lastname, firstname or middlename
    switch($namelist) {
        case 'lastname':
        $request = array('ramirez', 'corazon', 'gonzaga');
        break;
        case 'firstname':
        $request = array('michael', 'michaela', 'angel');
        break;
        case 'middlename':
        $request = array('osaka', 'oscar', 'roxas');
        break;
    }
    return $request;
}
function fullname() {
    $namelist = '';
    $namelists = namelist();
    foreach ($namelists as $names) {
        $namedata = ''; // moved
        $namerequest = nameRequest($names);
        foreach ($namerequest as $namerequests){
            $namedata .= $namerequests . ',';
        }
        $namelist .= $names . ': ' . $namedata . "\n"; // new
    }
    return $namelist; // modified
}
echo fullname();
?>

注意：我删除了测试的面向对象测试：http://phpfiddle.org/main/code/v82x-czc4

另请考虑使用implode()代替内部foreach。它更短，将解决您仍然存在的尾随,问题。

Answer 3

使用此代码，从上面的代码开始，它非常简单，简单和简短。因为foreach循环在上面的代码上运行了2次，所以它会影响执行时间，所以请试试这个

<?php
public function namelist() {
      return array('lastname', 'firstname', 'middlename');
}

public function nameRequest($namelist) { // either lastname, firstname or middlename
      switch($namelist) {
            case 'lastname':
                $request = array('ramirez', 'corazon', 'gonzaga');
            break;
            case 'firstname':
                $request = array('michael', 'michaela', 'angel');
            break;
            case 'middlename':
                $request = array('osaka', 'oscar', 'roxas');
            break;
      }
   return $request;
}

public function fullname() {
      $namelists = self::namelist();
      $fullname = '';
      foreach ($namelists as $names) {
          $namerequest = self::nameRequest($names);
          $nameIs = implode(",", $namerequest);
          $fullname .= $names.": " . $nameIs . "<br>";
      }
      return $fullname;
}

echo fullname();
?>

嵌套的foreach（）得到一个合适的结果

3 个答案: