php关联数组延迟答案

【问题标题】：php associative array deferencingphp关联数组延迟
【发布时间】：2014-08-09 15:10:41
【问题描述】：

我在 php 中创建了一个 imdb scraper。 scraper 首先 scrapes 在 imdb 上列出的前 'n' 部电影及其前 15 名演员，然后输入任何演员的姓名和数字'm'它将显示该演员的顶级“m”电影。以下是相同的代码

<?php
$temp = fopen ("php://stdin","r");
$limit = fgets($temp);
$num=1;
$url= 'http://www.imdb.com/chart/top';
$doc = new DOMDocument();
//$docmovie = new DOMDocument();
@$doc->loadHTMLFile($url);
$selector = new DOMXPath($doc);

while($num<=$limit)
{
  $str = "//*[@id=\"main\"]/div/div[2]/table/tbody/tr[".$num."]/td[2]/a";
  $span = $selector->query($str)->item(0);
  $movie = $span->nodeValue."<br>";
  //echo "<br>".$movie."<br>";
  $url_movie = $span->getAttribute('href');
  $url_movie = "http://www.imdb.com".str_replace("?ref_=chttp_tt_".$num,"",$url_movie)."fullcredits";
  @$doc->loadHTMLFile($url_movie);
  $select = new DOMXPath($doc);
  $str = "//*[@class=\"cast_list\"]";
  $span = $select->query($str)->item(0);
  for($x=2;$x<17;$x++)
  {
    $table = $doc->getElementsByTagName('table')->item(2)->getElementsByTagName('td')->item(2+(4*($x-2)));
    $actor =  $table->nodeValue."<br>";
    if($arr[trim($actor)][0]==NULL)
      $arr[trim($actor)][0]=0;
    $arr[trim($actor)][++$arr[trim($actor)][0]]=$movie;
    //var_dump($arr[$actor]);
  }
  $num++;
}
var_dump($arr);
if($arr['Morgan Freeman'][0]==NULL)
  echo "Actor not in list";
else
{
  $limit=$arr['Morgan Freeman'][0];
  for($x=1;x<=$limit;$x++)
  {
    echo $arr['Morgan Freeman'][$x]."<br>";
  }
}
?>

这里我输入 5 作为电影的初始数量，将“肖申克的救赎”和“黑暗骑士”作为“摩根弗里曼”的电影..$arr 存储这些值，从 var_dump( $arr);但是当我查询 $arr['Morgan Freeman'] 时，它仍然给出“演员不在列表中”...... 有人可以帮我理解为什么会这样吗？

var_dump($arr) 的输出是

array(69) { ["Tim Robbins 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Morgan Freeman 
"]=> array(3) { [0]=> int(2) [1]=> string(28) "The Shawshank Redemption
" [2]=> string(19) "The Dark Knight
" } ["Bob Gunton 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["William Sadler 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Clancy Brown 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Gil Bellows 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Mark Rolston 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["James Whitmore 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Jeffrey DeMunn 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Larry Brandenburg 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Neil Giuntoli 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Brian Libby 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["David Proval 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Joseph Ragno 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Jude Ciccolella 
"]=> array(2) { [0]=> int(1) [1]=> string(28) "The Shawshank Redemption
" } ["Marlon Brando 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Al Pacino 
"]=> array(3) { [0]=> int(2) [1]=> string(17) "The Godfather
" [2]=> string(26) "The Godfather: Part II
" } ["James Caan 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Richard S. Castellano 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Robert Duvall 
"]=> array(3) { [0]=> int(2) [1]=> string(17) "The Godfather
" [2]=> string(26) "The Godfather: Part II
" } ["Sterling Hayden 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["John Marley 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Richard Conte 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Al Lettieri 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Diane Keaton 
"]=> array(3) { [0]=> int(2) [1]=> string(17) "The Godfather
" [2]=> string(26) "The Godfather: Part II
" } ["Abe Vigoda 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Talia Shire 
"]=> array(3) { [0]=> int(2) [1]=> string(17) "The Godfather
" [2]=> string(26) "The Godfather: Part II
" } ["Gianni Russo 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["John Cazale 
"]=> array(3) { [0]=> int(2) [1]=> string(17) "The Godfather
" [2]=> string(26) "The Godfather: Part II
" } ["Rudy Bond 
"]=> array(2) { [0]=> int(1) [1]=> string(17) "The Godfather
" } ["Robert De Niro 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Lee Strasberg 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Michael V. Gazzo 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["G.D. Spradlin 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Richard Bright 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Gastone Moschin 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Tom Rosqui 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Bruno Kirby 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Frank Sivero 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Francesca De Sapio 
"]=> array(2) { [0]=> int(1) [1]=> string(26) "The Godfather: Part II
" } ["Christian Bale 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Heath Ledger 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Aaron Eckhart 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Michael Caine 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Maggie Gyllenhaal 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Gary Oldman 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Monique Gabriela Curnen 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Ron Dean 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Cillian Murphy 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Chin Han 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Nestor Carbonell 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Eric Roberts 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Ritchie Coster 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Anthony Michael Hall 
"]=> array(2) { [0]=> int(1) [1]=> string(19) "The Dark Knight
" } ["Tim Roth 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Amanda Plummer 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Laura Lovelace 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["John Travolta 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Samuel L. Jackson 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Phil LaMarr 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Frank Whaley 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Burr Steers 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Bruce Willis 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Ving Rhames 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Paul Calderon 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Bronagh Gallagher 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Rosanna Arquette 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Eric Stoltz 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } ["Uma Thurman 
"]=> array(2) { [0]=> int(1) [1]=> string(16) "Pulp Fiction
" } }

print_r($arr) 的输出是

【问题讨论】：

你能打印_r($arr);并显示结果？然后我们可以检查出了什么问题
我刚刚编辑了问题，将 var_dump($arr) 和 print_r($arr) 的输出包括在内。您现在可以尝试推理出问题吗？
嗯，我认为这是因为数组中有一个数组我认为你应该使用 echo arr[0][1] 来获取标题
这就是我用过的...我用 $arr['Actor Name'] 来存储演员的名字 $arr[][0] 来存储他所在的电影数量和 $arr [][1...m] 来存储他演过的电影的标题..

标签： php arrays web-scraping

【解决方案1】：

我答应检查..所以我检查了..由于限制，我无法使用 fopen 等，所以我制作了一个像 urs 一样的数组模型..有 2 个名字..我重写了一些东西只是为了让你进入正确的方向请cchck http://pastebin.com/uuYCEgYu

代码如下：

// DEMO ARRAY
$arr = Array();

$arr['Tim Robbins']  = Array ();
array_push($arr['Tim Robbins'],'1','The Shawshank Redemption');

$arr['Morgan Freeman']  = Array ();
array_push($arr['Morgan Freeman'],'2','The Shawshank Redemption', 'The Dark Knight');
//print_r($arr);
//DEMO ARRAY END


//LOOP ARRAY
foreach ($arr as $key=>$data) {
  echo $key, "<BR>"; // = actor name

  //MATCH ACTOR NAME
  if ($key = 'Morgan Freeman') {
    echo 'actor found<BR>';  

    //THERE IS A MATCH SO SHOW DATA
    foreach ($arr['Morgan Freeman'] as $data) {
      echo $data;
    }

  } else {
    echo 'actor not found<BR>';
  }

}

【讨论】：