嵌套的foreach（） [英] Nested foreach()

问题描述

我有以下数组：

 阵列（
  [1] =＆GT;阵列（
    [spubid] =＆GT; A00319
    [sentered_by] =＆GT; pubs_batchadd.php
    [sarticle] =＆GT;奥里诺科河，Atabapo水域横向混合
    [spublication] =＆GT; ACTA Cientifica Venezolana
    [雄鹿] =＆GT; ACTA，合流，奥里诺科河，河流，委内瑞拉水域
    [作者] =＆GT;阵列（
      [1] =＆GT;阵列（
        [STYPE] =＆GT;作者
        [iorder] =＆GT; 1
        [sfirst] =＆GT;一个
        [slast] =＆GT;安德森）
      [2] =＆GT;阵列（
        [STYPE] =＆GT;作者
        [iorder] =＆GT; 2
        [sfirst] =＆GT; S.
        [slast] =＆GT;约翰逊）
      [3] =＆GT;阵列（
        [STYPE] =＆GT;作者
        [iorder] =＆GT; 3
        [sfirst] =＆GT; J.
        [slast] =＆GT; DOE）
      ）
    ）
  ）
 

我使用一个嵌套的foreach（）外数组中通过要素走，但是当涉及到​​随地吐痰作者的名单，我遇到了问题。即输出由于疯狂的foreach（）嵌套中的每一个的多个（多）倍的问题。什么是比这个例子中嵌套的foreach（）循环更好的方法？

UPDATE（带解决方案）

下面是循环我定居在，有点乱（恕我直言），但它的工作原理：

  $ sauthors = NULL;
$ stitle = NULL;的foreach（$ apubs为$ apub）
{
  $ stitle = $ apub ['sarticle'];
  的foreach（$ apub为$ SVAR =＆GT; $ SVAL）
  {
    如果（$ SVAR ===作家）
    {
      的foreach（$ SVAL为apeople $）
      {
        $ sauthors = $ apeople ['slast']，$ apeople ['sfirst']。;;
      }
    }
  }
  回声$ sauthors＆LT; BR /＆GT; \\ n $的stitle＆LT; BR /＆GT; \\ N的;
}
 

解决方案

你为什么不这样做。

 的foreach（$ apubs为$ apub）{
  $ sauthors ='';
  $ stitle = $ apub ['sarticle'];
  的foreach（$ apub ['作家']为$作家）{
    $ sauthors = $作者['slast']，$作者['sfirst']。;;
  }  回声$ sauthors＆LT; BR /＆GT; \\ n $的stitle＆LT; BR /＆GT; \\ N的;
}
 

I have the following array:

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 ) 
      ) 
    ) 
  )

I am using a nested foreach() to walk through the elements in the outer array but when it comes to spitting out the list of authors I am running into problems. Namely the problem of outputting each one multiple (multiple) times because of the crazy foreach() nesting. What would be a better approach than nesting foreach() loops in this example?

UPDATE (With solution)

Here is the loop I settled on, a bit messy (IMHO) but it works:

$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";
}

解决方案

Why don't you do

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";
}

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