嵌套的foreach()

Question

我有以下数组:

Array ( 
  [1] => Array ( 
    [spubid] => A00319 
    [sentered_by] => pubs_batchadd.php
    [sarticle] => Lateral mixing of the waters of the Orinoco, Atabapo
    [spublication] => Acta Cientifica Venezolana
    [stags] => acta,confluence,orinoco,rivers,venezuela,waters
    [authors] => Array ( 
      [1] => Array ( 
        [stype] => Author 
        [iorder] => 1 
        [sfirst] => A
        [slast] => Andersen ) 
      [2] => Array ( 
        [stype] => Author 
        [iorder] => 2 
        [sfirst] => S.
        [slast] => Johnson ) 
      [3] => Array ( 
        [stype] => Author 
        [iorder] => 3 
        [sfirst] => J. 
        [slast] => Doe ) 
      ) 
    ) 
  )

我正在使用嵌套的foreach()遍历外部数组中的元素,但是当涉及吐出作者列表时,我遇到了问题.即由于疯狂的foreach()嵌套而导致每个输出多次(多次)的问题.在这个例子中,比嵌套foreach()循环更好的方法是什么？

更新(有解决方案)

这是我定居的循环,有点凌乱(恕我直言),但它的工作原理:

$sauthors = NULL;
$stitle = NULL;

foreach($apubs as $apub)
{
  $stitle = $apub['sarticle'];
  foreach($apub as $svar=>$sval)
  {
    if($svar === "authors")
    {
      foreach($sval as $apeople)
      {
        $sauthors .= $apeople['slast'].", ".$apeople['sfirst']."; ";
      }
    }
  }
  echo "$sauthors<br />\n$stitle<br />\n";
}

Answer 1

你为什么不这样做

foreach($apubs as $apub) {
  $sauthors = '';
  $stitle = $apub['sarticle'];
  foreach($apub['authors'] as $author) {
    $sauthors .= $author['slast'].", ".$author['sfirst']."; ";
  }

  echo "$sauthors<br />\n$stitle<br />\n";
}

Answer 2

只是为了好玩。如果您确实想避免循环，请尝试以下操作：

// Pre PHP 5.3:

function cb2($e)
{
    return $e['slast'] . ', ' . $e['sfirst'];
}

function cb1($e)
{
    $authors = array_map('cb2', $e['authors']);
    echo implode('; ', $authors) . ":<br />\n" . $e['sarticle'] . "<br />\n";
}

array_walk($data, 'cb1');



// PHP 5.3 (untested):

array_walk($data, function($e)
{
    $authors = array_map(function($e)
    {
        return $e['slast'] . ', ' . $e['sfirst'];
    },
    $e['authors']);

    echo implode('; ', $authors) . ":<br />\n" . $e['sarticle'] . "<br />\n";
});