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집백엔드 개발PHP 튜토리얼simple_html_dom执行出现死循环如何解决？
simple_html_dom执行出现死循环如何解决？
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Jul 06, 2016 pm 01:51 PM
htmlhtml5node.jsphppython

<code>include('simple_html_dom/simple_html_dom.php');
$list_html = new simple_html_dom();
$list_html->load_file('http://www.yiichina.com/doc/guide/2.0/structure-applications');
var_dump($list_html->find('a.list-group-item',0));exit();
</code>

这段代码执行之后在页面中无限dump数据出来，就像死循环一样如何解决？a.list-group-item元素是肯定存在的。。。

回复内容：

<code>include('simple_html_dom/simple_html_dom.php');
$list_html = new simple_html_dom();
$list_html->load_file('http://www.yiichina.com/doc/guide/2.0/structure-applications');
var_dump($list_html->find('a.list-group-item',0));exit();
</code>

这段代码执行之后在页面中无限dump数据出来，就像死循环一样如何解决？a.list-group-item元素是肯定存在的。。。

用过javascript应该知道，这样dom其实是一棵树，即DOM Tree，每一个DOM节点（node）都会包含其直接父节点（parent node）和节点的序列号方便进行定位和遍历渲染出页面，请想想，嵌套层次如果稍微深一点的话，你var_dump肯定会因为层次太深而无法输出（没有安装xdebug时一般表现为超时），安装xdebug之后，请见：https://xdebug.org/docs/all_settings#var_display_max_depth，一般会输出最多3层的嵌套深度，所以我建议不要使用var_dump去调试simple_html_dom或其simple_html_dom_node的对象，可以安装xdebug进行断点调试，玩点高端的哈，具体怎么调试已经超出本回答范围，请自行百度“xdebug断点调试”。

内容比较多, 评论不让发, 只能发回答了...

输出的数据比较多, 是因为你dump了几个对象 但没到

无限dump数据的程度

<code>class simple_html_dom_node#147 (9) {
  public $nodetype =>
  int(1)
  public $tag =>
  string(1) "a"
  public $attr =>
  array(4) {
    'class' =>
    string(15) "list-group-item"
    'href' =>
    string(5) "#w0-1"
    'data-toggle' =>
    string(8) "collapse"
    'data-parent' =>
    string(3) "#w0"
  }
  public $children =>
  array(1) {
    [0] =>
    class simple_html_dom_node#149 (9) {
      public $nodetype =>
      int(1)
      public $tag =>
      string(1) "b"
      public $attr =>
      array(1) {
        ...
      }
      public $children =>
      array(0) {
        ...
      }
      public $nodes =>
      array(0) {
        ...
      }
      public $parent =>
              ...

      public $_ =>
      array(5) {
        ...
      }
      public $tag_start =>
      int(3100)
      private $dom =>
      class simple_html_dom#3 (23) {
        ...
      }
    }
  }
  public $nodes =>
  array(2) {
    [0] =>
    class simple_html_dom_node#148 (9) {
      public $nodetype =>
      int(3)
      public $tag =>
      string(4) "text"
      public $attr =>
      array(0) {
        ...
      }
      public $children =>
      array(0) {
        ...
      }
      public $nodes =>
      array(0) {
        ...
      }
      public $parent =>
              ...

      public $_ =>
      array(1) {
        ...
      }
      public $tag_start =>
      int(0)
      private $dom =>
      class simple_html_dom#3 (23) {
        ...
      }
    }
    [1] =>
    class simple_html_dom_node#149 (9) {
      public $nodetype =>
      int(1)
      public $tag =>
      string(1) "b"
      public $attr =>
      array(1) {
        ...
      }
      public $children =>
      array(0) {
        ...
      }
      public $nodes =>
      array(0) {
        ...
      }
      public $parent =>
              ...

      public $_ =>
      array(5) {
        ...
      }
      public $tag_start =>
      int(3100)
      private $dom =>
      class simple_html_dom#3 (23) {
        ...
      }
    }
  }
  public $parent =>
  class simple_html_dom_node#146 (9) {
    public $nodetype =>
    int(1)
    public $tag =>
    string(3) "div"
    public $attr =>
    array(2) {
      'id' =>
      string(2) "w0"
      'class' =>
      string(10) "list-group"
    }
    public $children =>
    array(32) {
      [0] =>
              ...

      [1] =>
      class simple_html_dom_node#150 (9) {
        ...
      }
      [2] =>
      class simple_html_dom_node#157 (9) {
        ...
      }
      [3] =>
      class simple_html_dom_node#160 (9) {
        ...
      }
      [4] =>
      class simple_html_dom_node#182 (9) {
        ...
      }
      [5] =>
      class simple_html_dom_node#185 (9) {
        ...
      }
      [6] =>
      class simple_html_dom_node#222 (9) {
        ...
      }
      [7] =>
      class simple_html_dom_node#225 (9) {
        ...
      }
      [8] =>
      class simple_html_dom_node#250 (9) {
        ...
      }
      [9] =>
      class simple_html_dom_node#253 (9) {
        ...
      }
      [10] =>
      class simple_html_dom_node#281 (9) {
        ...
      }
      [11] =>
      class simple_html_dom_node#284 (9) {
        ...
      }
      [12] =>
      class simple_html_dom_node#309 (9) {
        ...
      }
      [13] =>
      class simple_html_dom_node#312 (9) {
        ...
      }
      [14] =>
      class simple_html_dom_node#328 (9) {
        ...
      }
      [15] =>
      class simple_html_dom_node#331 (9) {
        ...
      }
      [16] =>
      class simple_html_dom_node#353 (9) {
        ...
      }
      [17] =>
      class simple_html_dom_node#356 (9) {
        ...
      }
      [18] =>
      class simple_html_dom_node#372 (9) {
        ...
      }
      [19] =>
      class simple_html_dom_node#375 (9) {
        ...
      }
      [20] =>
      class simple_html_dom_node#391 (9) {
        ...
      }
      [21] =>
      class simple_html_dom_node#394 (9) {
        ...
      }
      [22] =>
      class simple_html_dom_node#422 (9) {
        ...
      }
      [23] =>
      class simple_html_dom_node#425 (9) {
        ...
      }
      [24] =>
      class simple_html_dom_node#435 (9) {
        ...
      }
      [25] =>
      class simple_html_dom_node#438 (9) {
        ...
      }
      [26] =>
      class simple_html_dom_node#457 (9) {
        ...
      }
      [27] =>
      class simple_html_dom_node#460 (9) {
        ...
      }
      [28] =>
      class simple_html_dom_node#491 (9) {
        ...
      }
      [29] =>
      class simple_html_dom_node#494 (9) {
        ...
      }
      [30] =>
      class simple_html_dom_node#501 (9) {
        ...
      }
      [31] =>
      class simple_html_dom_node#504 (9) {
        ...
      }
    }
    public $nodes =>
    array(47) {
      [0] =>
              ...

      [1] =>
      class simple_html_dom_node#150 (9) {
        ...
      }
      [2] =>
      class simple_html_dom_node#156 (9) {
        ...
      }
      [3] =>
      class simple_html_dom_node#157 (9) {
        ...
      }
      [4] =>
      class simple_html_dom_node#160 (9) {
        ...
      }
      [5] =>
      class simple_html_dom_node#181 (9) {
        ...
      }
      [6] =>
      class simple_html_dom_node#182 (9) {
        ...
      }
      [7] =>
      class simple_html_dom_node#185 (9) {
        ...
      }
      [8] =>
      class simple_html_dom_node#221 (9) {
        ...
      }
      [9] =>
      class simple_html_dom_node#222 (9) {
        ...
      }
      [10] =>
      class simple_html_dom_node#225 (9) {
        ...
      }
      [11] =>
      class simple_html_dom_node#249 (9) {
        ...
      }
      [12] =>
      class simple_html_dom_node#250 (9) {
        ...
      }
      [13] =>
      class simple_html_dom_node#253 (9) {
        ...
      }
      [14] =>
      class simple_html_dom_node#280 (9) {
        ...
      }
      [15] =>
      class simple_html_dom_node#281 (9) {
        ...
      }
      [16] =>
      class simple_html_dom_node#284 (9) {
        ...
      }
      [17] =>
      class simple_html_dom_node#308 (9) {
        ...
      }
      [18] =>
      class simple_html_dom_node#309 (9) {
        ...
      }
      [19] =>
      class simple_html_dom_node#312 (9) {
        ...
      }
      [20] =>
      class simple_html_dom_node#327 (9) {
        ...
      }
      [21] =>
      class simple_html_dom_node#328 (9) {
        ...
      }
      [22] =>
      class simple_html_dom_node#331 (9) {
        ...
      }
      [23] =>
      class simple_html_dom_node#352 (9) {
        ...
      }
      [24] =>
      class simple_html_dom_node#353 (9) {
        ...
      }
      [25] =>
      class simple_html_dom_node#356 (9) {
        ...
      }
      [26] =>
      class simple_html_dom_node#371 (9) {
        ...
      }
      [27] =>
      class simple_html_dom_node#372 (9) {
        ...
      }
      [28] =>
      class simple_html_dom_node#375 (9) {
        ...
      }
      [29] =>
      class simple_html_dom_node#390 (9) {
        ...
      }
      [30] =>
      class simple_html_dom_node#391 (9) {
        ...
      }
      [31] =>
      class simple_html_dom_node#394 (9) {
        ...
      }
      [32] =>
      class simple_html_dom_node#421 (9) {
        ...
      }
      [33] =>
      class simple_html_dom_node#422 (9) {
        ...
      }
      [34] =>
      class simple_html_dom_node#425 (9) {
        ...
      }
      [35] =>
      class simple_html_dom_node#434 (9) {
        ...
      }
      [36] =>
      class simple_html_dom_node#435 (9) {
        ...
      }
      [37] =>
      class simple_html_dom_node#438 (9) {
        ...
      }
      [38] =>
      class simple_html_dom_node#456 (9) {
        ...
      }
      [39] =>
      class simple_html_dom_node#457 (9) {
        ...
      }
      [40] =>
      class simple_html_dom_node#460 (9) {
        ...
      }
      [41] =>
      class simple_html_dom_node#490 (9) {
        ...
      }
      [42] =>
      class simple_html_dom_node#491 (9) {
        ...
      }
      [43] =>
      class simple_html_dom_node#494 (9) {
        ...
      }
      [44] =>
      class simple_html_dom_node#500 (9) {
        ...
      }
      [45] =>
      class simple_html_dom_node#501 (9) {
        ...
      }
      [46] =>
      class simple_html_dom_node#504 (9) {
        ...
      }
    }
    public $parent =>
    class simple_html_dom_node#144 (9) {
      public $nodetype =>
      int(1)
      public $tag =>
      string(3) "div"
      public $attr =>
      array(1) {
        ...
      }
      public $children =>
      array(1) {
        ...
      }
      public $nodes =>
      array(3) {
        ...
      }
      public $parent =>
      class simple_html_dom_node#142 (9) {
        ...
      }
      public $_ =>
      array(5) {
        ...
      }
      public $tag_start =>
      int(2936)
      private $dom =>
      class simple_html_dom#3 (23) {
        ...
      }
    }
    public $_ =>
    array(5) {
      [0] =>
      int(143)
      [2] =>
      array(2) {
        ...
      }
      [3] =>
      array(2) {
        ...
      }
      [7] =>
      string(0) ""
      [1] =>
      int(513)
    }
    public $tag_start =>
    int(2962)
    private $dom =>
    class simple_html_dom#3 (23) {
      public $root =>
      class simple_html_dom_node#2 (9) {
        ...
      }
      public $nodes =>
      array(1787) {
        ...
      }
      public $callback =>
      NULL
      public $lowercase =>
      bool(true)
      public $original_size =>
      int(48883)
      public $size =>
      int(46297)
      protected $pos =>
      int(46297)
      protected $doc =>
      string(46297) "   <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="csrf-param" content="_csrf">     <meta name="csrf-token" content="Lld4a0wtQW9gBz46Hlw0VxcxEjwYRytCQyVBPzxvKR1tJEkBOl4WDQ=="> <title>搴旂敤涓讳綋 - Yii 2.0 鏉冨▉鎸囧崡 - 鏂囨。 - Yii Framework 涓枃绀惧尯</title> <meta name="keywords" content="Yii Framewok, 鏉冨▉鎸囧崡"> <meta name="description" content="Yi" ... protected>
      NULL
      protected $cursor =>
      int(1787)
      protected $parent =>
      class simple_html_dom_node#2 (9) {
        ...
      }
      protected $noise =>
      array(90) {
        ...
      }
      protected $token_blank =>
      string(4) "     
"
      protected $token_equal =>
      string(4) " =/>"
      protected $token_slash =>
      string(6) " />
    "
      protected $token_attr =>
      string(2) " >"
      public $_charset =>
      string(5) "UTF-8"
      public $_target_charset =>
      string(5) "UTF-8"
      protected $default_br_text =>
      string(2) "
"
      public $default_span_text =>
      string(1) " "
      protected $self_closing_tags =>
      array(9) {
        ...
      }
      protected $block_tags =>
      array(6) {
        ...
      }
      protected $optional_closing_tags =>
      array(11) {
        ...
      }
    }
  }
  public $_ =>
  array(5) {
    [0] =>
    int(144)
    [2] =>
    array(4) {
      [0] =>
      int(0)
      [1] =>
      int(0)
      [2] =>
      int(0)
      [3] =>
      int(0)
    }
    [3] =>
    array(4) {
      [0] =>
      array(3) {
        ...
      }
      [1] =>
      array(3) {
        ...
      }
      [2] =>
      array(3) {
        ...
      }
      [3] =>
      array(3) {
        ...
      }
    }
    [7] =>
    string(0) ""
    [1] =>
    int(147)
  }
  public $tag_start =>
  int(2994)
  private $dom =>
  class simple_html_dom#3 (23) {
    public $root =>
    class simple_html_dom_node#2 (9) {
      public $nodetype =>
      int(5)
      public $tag =>
      string(4) "root"
      public $attr =>
      array(0) {
        ...
      }
      public $children =>
      array(2) {
        ...
      }
      public $nodes =>
      array(4) {
        ...
      }
      public $parent =>
      NULL
      public $_ =>
      array(2) {
        ...
      }
      public $tag_start =>
      int(0)
      private $dom =>
              ...

    }
    public $nodes =>
    array(1787) {
      [0] =>
      class simple_html_dom_node#2 (9) {
        ...
      }
      [1] =>
      class simple_html_dom_node#4 (9) {
        ...
      }
      [2] =>
      class simple_html_dom_node#5 (9) {
        ...
      }
      [3] =>
      class simple_html_dom_node#6 (9) {
        ...
      }
      [4] =>
      class simple_html_dom_node#7 (9) {
        ...
      }
      [5] =>
      class simple_html_dom_node#8 (9) {
        ...
      }
      [6] =>
      class simple_html_dom_node#9 (9) {
        ...
      }
      [7] =>
      class simple_html_dom_node#10 (9) {
        ...
      }
      [8] =>
      class simple_html_dom_node#11 (9) {
        ...
      }
      [9] =>
      class simple_html_dom_node#12 (9) {
        ...
      }
      [10] =>
      class simple_html_dom_node#13 (9) {
        ...
      }
      [11] =>
      class simple_html_dom_node#14 (9) {
        ...
      }
      [12] =>
      class simple_html_dom_node#15 (9) {
        ...
      }
      [13] =>
      class simple_html_dom_node#16 (9) {
        ...
      }
      [14] =>
      class simple_html_dom_node#17 (9) {
        ...
      }
      [15] =>
      class simple_html_dom_node#18 (9) {
        ...
      }
      [16] =>
      class simple_html_dom_node#19 (9) {
        ...
      }
      [17] =>
      class simple_html_dom_node#20 (9) {
        ...
      }
      [18] =>
      class simple_html_dom_node#21 (9) {
        ...
      }
      [19] =>
      class simple_html_dom_node#22 (9) {
        ...
      }
      [20] =>
      class simple_html_dom_node#23 (9) {
        ...
      }
      [21] =>
      class simple_html_dom_node#24 (9) {
        ...
      }
      [22] =>
      class simple_html_dom_node#25 (9) {
        ...
      }
      [23] =>
      class simple_html_dom_node#26 (9) {
        ...
      }
      [24] =>
      class simple_html_dom_node#27 (9) {
        ...
      }
      [25] =>
      class simple_html_dom_node#28 (9) {
        ...
      }
      [26] =>
      class simple_html_dom_node#29 (9) {
        ...
      }
      [27] =>
      class simple_html_dom_node#30 (9) {
        ...
      }
      [28] =>
      class simple_html_dom_node#31 (9) {
        ...
      }
      [29] =>
      class simple_html_dom_node#32 (9) {
        ...
      }
      [30] =>
      class simple_html_dom_node#33 (9) {
        ...
      }
      [31] =>
      class simple_html_dom_node#34 (9) {
        ...
      }
      [32] =>
      class simple_html_dom_node#35 (9) {
        ...
      }
      [33] =>
      class simple_html_dom_node#36 (9) {
        ...
      }
      [34] =>
      class simple_html_dom_node#37 (9) {
        ...
      }
      [35] =>
      class simple_html_dom_node#38 (9) {
        ...
      }
      [36] =>
      class simple_html_dom_node#39 (9) {
        ...
      }
      [37] =>
      class simple_html_dom_node#40 (9) {
        ...
      }
      [38] =>
      class simple_html_dom_node#41 (9) {
        ...
      }
      [39] =>
      class simple_html_dom_node#42 (9) {
        ...
      }
      [40] =>
      class simple_html_dom_node#43 (9) {
        ...
      }
      [41] =>
      class simple_html_dom_node#44 (9) {
        ...
      }
      [42] =>
      class simple_html_dom_node#45 (9) {
        ...
      }
      [43] =>
      class simple_html_dom_node#46 (9) {
        ...
      }
      [44] =>
      class simple_html_dom_node#47 (9) {
        ...
      }
      [45] =>
      class simple_html_dom_node#48 (9) {
        ...
      }
      [46] =>
      class simple_html_dom_node#49 (9) {
        ...
      }
      [47] =>
      class simple_html_dom_node#50 (9) {
        ...
      }
      [48] =>
      class simple_html_dom_node#51 (9) {
        ...
      }
      [49] =>
      class simple_html_dom_node#52 (9) {
        ...
      }
      [50] =>
      class simple_html_dom_node#53 (9) {
        ...
      }
      [51] =>
      class simple_html_dom_node#54 (9) {
        ...
      }
      [52] =>
      class simple_html_dom_node#55 (9) {
        ...
      }
      [53] =>
      class simple_html_dom_node#56 (9) {
        ...
      }
      [54] =>
      class simple_html_dom_node#57 (9) {
        ...
      }
      [55] =>
      class simple_html_dom_node#58 (9) {
        ...
      }
      [56] =>
      class simple_html_dom_node#59 (9) {
        ...
      }
      [57] =>
      class simple_html_dom_node#60 (9) {
        ...
      }
      [58] =>
      class simple_html_dom_node#61 (9) {
        ...
      }
      [59] =>
      class simple_html_dom_node#62 (9) {
        ...
      }
      [60] =>
      class simple_html_dom_node#63 (9) {
        ...
      }
      [61] =>
      class simple_html_dom_node#64 (9) {
        ...
      }
      [62] =>
      class simple_html_dom_node#65 (9) {
        ...
      }
      [63] =>
      class simple_html_dom_node#66 (9) {
        ...
      }
      [64] =>
      class simple_html_dom_node#67 (9) {
        ...
      }
      [65] =>
      class simple_html_dom_node#68 (9) {
        ...
      }
      [66] =>
      class simple_html_dom_node#69 (9) {
        ...
      }
      [67] =>
      class simple_html_dom_node#70 (9) {
        ...
      }
      [68] =>
      class simple_html_dom_node#71 (9) {
        ...
      }
      [69] =>
      class simple_html_dom_node#72 (9) {
        ...
      }
      [70] =>
      class simple_html_dom_node#73 (9) {
        ...
      }
      [71] =>
      class simple_html_dom_node#74 (9) {
        ...
      }
      [72] =>
      class simple_html_dom_node#75 (9) {
        ...
      }
      [73] =>
      class simple_html_dom_node#76 (9) {
        ...
      }
      [74] =>
      class simple_html_dom_node#77 (9) {
        ...
      }
      [75] =>
      class simple_html_dom_node#78 (9) {
        ...
      }
      [76] =>
      class simple_html_dom_node#79 (9) {
        ...
      }
      [77] =>
      class simple_html_dom_node#80 (9) {
        ...
      }
      [78] =>
      class simple_html_dom_node#81 (9) {
        ...
      }
      [79] =>
      class simple_html_dom_node#82 (9) {
        ...
      }
      [80] =>
      class simple_html_dom_node#83 (9) {
        ...
      }
      [81] =>
      class simple_html_dom_node#84 (9) {
        ...
      }
      [82] =>
      class simple_html_dom_node#85 (9) {
        ...
      }
      [83] =>
      class simple_html_dom_node#86 (9) {
        ...
      }
      [84] =>
      class simple_html_dom_node#87 (9) {
        ...
      }
      [85] =>
      class simple_html_dom_node#88 (9) {
        ...
      }
      [86] =>
      class simple_html_dom_node#89 (9) {
        ...
      }
      [87] =>
      class simple_html_dom_node#90 (9) {
        ...
      }
      [88] =>
      class simple_html_dom_node#91 (9) {
        ...
      }
      [89] =>
      class simple_html_dom_node#92 (9) {
        ...
      }
      [90] =>
      class simple_html_dom_node#93 (9) {
        ...
      }
      [91] =>
      class simple_html_dom_node#94 (9) {
        ...
      }
      [92] =>
      class simple_html_dom_node#95 (9) {
        ...
      }
      [93] =>
      class simple_html_dom_node#96 (9) {
        ...
      }
      [94] =>
      class simple_html_dom_node#97 (9) {
        ...
      }
      [95] =>
      class simple_html_dom_node#98 (9) {
        ...
      }
      [96] =>
      class simple_html_dom_node#99 (9) {
        ...
      }
      [97] =>
      class simple_html_dom_node#100 (9) {
        ...
      }
      [98] =>
      class simple_html_dom_node#101 (9) {
        ...
      }
      [99] =>
      class simple_html_dom_node#102 (9) {
        ...
      }
      [100] =>
      class simple_html_dom_node#103 (9) {
        ...
      }
      [101] =>
      class simple_html_dom_node#104 (9) {
        ...
      }
      [102] =>
      class simple_html_dom_node#105 (9) {
        ...
      }
      [103] =>
      class simple_html_dom_node#106 (9) {
        ...
      }
      [104] =>
      class simple_html_dom_node#107 (9) {
        ...
      }
      [105] =>
      class simple_html_dom_node#108 (9) {
        ...
      }
      [106] =>
      class simple_html_dom_node#109 (9) {
        ...
      }
      [107] =>
      class simple_html_dom_node#110 (9) {
        ...
      }
      [108] =>
     y(3) {
        ...
      }
      'th' =>
      array(1) {
        ...
      }
      'td' =>
      array(1) {
        ...
      }
      'li' =>
      array(1) {
        ...
      }
      'dt' =>
      array(2) {
        ...
      }
      'dd' =>
      array(2) {
        ...
      }
      'dl' =>
      array(2) {
        ...
      }
      'p' =>
      array(1) {
        ...
      }
      'nobr' =>
      array(1) {
        ...
      }
      'b' =>
      array(1) {
        ...
      }
      'option' =>
      array(1) {
        ...
      }
    }
  }
}</code>
성명
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