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该法典中是否有阻止执行的内容?
原标题：Is there something in this code block that would stop execution?
  • 时间：2011-10-28 07:25:50
  •  标签：
  • php

我正在平整一个网页,并跟踪链接,以便绘制从一页到另一页的链接。 我只拿上链接的网页名称、用于链接网页的URL和URL线的网页名称。

我的《守则》顺利地发现我感兴趣的环节和代号分页,以便找到更多的产品链接。 至少有100页,其中有几百页,因此它有数份穿透镜。 我正在以以下形式构建一个产品:$products[index], 包含一个阵列array([ url] =>URLToPage, [职称] => 职称OfPage, [链接_title] => 职称OfLinkedPage),我希望能表明这一点。

文字在我添加这张幻灯塔之前就行了,之后,文字将不再执行,而不会有错误、警告、通知或任何内容;这根本就永远不会达到文字的终结。 我列入了<代码>set_time_limit(0),以防止执行时间从到期,因为这一规定需要一些时间才能完成。 该代码是在产品阵列出现之后实施的,如果发现任何链接,产品总是一个阵列,而且我已经输出了检测案例中的美元链路——html——显示,这些页面正在按预期检索。 这是犯罪法典:

// Populate the destination link titles
if ( isset( $products ) && count( $products ) > 0 )
    {
        foreach( $products as $id => $product )
        {
             $from_this_page = $product[ url ];
             if ( $DEBUG ) echo  Parsing   . $from_this_page .  .<br /> ;
             $link_html_string = file_get_contents( $from_this_page, NULL, NULL, NULL, 500 );
             $string_parts = explode(  <title> , $link_html_string );
             $string_parts = explode(  </title> , $string_parts[1] );
             $products[$id][ link_title ] = $string_parts[0];
             if ( $DEBUG ) echo  Found title:   . $products[$id][ link_title ] .  <br /> ;
             ob_flush();
             flush();
        }
    }

然而,在阅读整个档案时,我对记忆的使用感到有些关切,因此,我通过限制读数来减少负荷(我认为)。 我或许认为,这本书正在使用所有给人头盔的记忆。 如果列入这一条款,它会数次通过这一漏洞,但在某个时候停止执行,这一点也不完全相同。 我会收到好几处重复的复文。

This is the full code for the script, included to answer questions regarding contents of $products in comments.

<?php
// PHP HTML DOM Parser from http://simplehtmldom.sourceforge.net/
require_once(  includes/simple_html_dom.php  );

//error_reporting( E_ALL );
set_time_limit( 0 );

// Debugging flag
$DEBUG = false;

function reportProducts( $category, $products )
{
    echo  <table width="90%" align="center"><tr><th colspan="3"> ;
    echo $category .   has   . count( $products ) .   products listed, or in subpages. ;
    echo  </th></tr> ;
    echo  <tr><td bgcolor="#777777" width="30%">This page</td>
        <td bgcolor="#bbbbbb" width="30%">links with</td>
        <td bgcolor="#777777" width="30%">to this page</td></tr> ;
    foreach( $products as $product )
    {
        echo  <tr><td bgcolor="#777777">  . $product[ title ] .  </td>
            <td bgcolor="#bbbbbb"><a href="  . $product[ url ] .  ">  . $product[ url ] . 
             </a></td><td bgcolor="#777777">  . $product[ link_title ] .  </td></tr> ;
    }
    echo  </table><br /> ;
    ob_flush(); // Server may buffer again, preventing incremental display
    flush();
}

function parseProductsForPage( $page_to_parse )
{
    global $DEBUG;
    $failed = false;
    $product_id = 0;
    $page_dom = new simple_html_dom();
    $page_html_string = @file_get_contents( $page_to_parse->href );
    $load_state = @$page_dom->load( $page_html_string );
    if ( $load_state === NULL )
    {
        // Find any direct product pages for this page
        if ( $DEBUG ) echo $page_to_parse->href .   being checked for products...  ;
        $possible = $page_dom->find(  a[onclick]  );
            foreach( $possible as $link )
            {
                if ( $link->innertext == "[ Add to cart ]" )
                {
                    $products[$product_id][ url ] = $link->href;
                    $titles = $page_dom->find(  title  );
                    $products[$product_id][ title ] = $titles[0]->innertext;
                    $product_id++;
                }
            }
        if ( $DEBUG ) 
        {
            if ( isset( $products ) )
            {
                echo count( $products ) .   found on page.<br /> ;
            } else
            {
                echo  0 found on page.<br /> ;
            }
        }

        // Find subpages...
        if ( $DEBUG ) echo $page_to_parse->href .   being checked for links...  ;
        $subpages = $page_dom->find(  a[class=buy]  );
        if ( $DEBUG ) echo count( $subpages ) .   found.<br /> ;
        // ... and parse
        foreach( $subpages as $subpage )
        {
            $subpage_dom = new simple_html_dom();
            $subpage_html_string = @file_get_contents( $subpage->href );
            $load_state = @$subpage_dom->load( $subpage_html_string );
            if ( $load_state === NULL )
            {
                // Find any direct product pages for this page
                if ( $DEBUG ) echo $subpage->href .   being checked for products...  ;
                $possible = $subpage_dom->find(  a[onclick]  );
                    foreach( $possible as $link )
                    {
                        if ( $link->innertext == "[ Add to cart ]" )
                        {
                            $products[$product_id][ url ] = $link->href;
                            $titles = $page_dom->find(  title  );
                            $products[$product_id][ title ] = $titles[0]->innertext;
                            $product_id++;
                        }
                    }
                if ( $DEBUG ) 
                {
                    if ( isset( $products ) )
                    {
                        echo count( $products ) .   found on page.<br /> ;
                    } else
                    {
                        echo  0 found on page.<br /> ;
                    }
                }
                $subpage_dom->clear();
            } else
            {
                $failed[] = $subpage->href;
            }
            $subpage_dom->clear();
            unset( $subpage_dom );
        }
        // Populate the destination link titles
        if ( isset( $products ) && count( $products ) > 0 )
        {
            foreach( $products as $id => $product )
            {
                // $from_this_page = $product[ url ];
                // if ( $DEBUG ) echo  Parsing   . $from_this_page .  .<br /> ;
                // $link_html_string = file_get_contents( $from_this_page, NULL, NULL, NULL, 500 );
                // $string_parts = explode(  <title> , $link_html_string );
                // $string_parts = explode(  </title> , $string_parts[1] );
                // $products[$id][ link_title ] = $string_parts[0];
                // if ( $DEBUG ) echo  Found title:   . $products[$id][ link_title ] .  <br /> ;
                // ob_flush();
                // flush();
            }
        }
    } else
    {
        $failed[] = $page_to_parse->href;
    }
    $titles = $page_dom->find(  title  );
    if ( isset( $products ) ) reportProducts( $titles[0]->innertext, $products );
    $page_dom->clear();
    unset( $page_dom );
    return $failed;
}

// Initialize the object
$html = new simple_html_dom();
$html->load_file(  index.html  );

// Start output buffer
ob_start();

// Find all product categories listed on the website
if ( $DEBUG ) echo  <h1>Collecting links from LHN...</h1> ;
$sidelinks = $html->find(  a[class=sidelink_main]  );
$html->clear();
unset( $html );

echo  <h1>Found   . count( $sidelinks ) .   categories.</h1><br /> ;
ob_flush(); // Server may buffer output, preventing incremental display
flush();

// Find links and products for each category
foreach( $sidelinks as $sidelink )
{
    if ( $DEBUG ) echo  Sending   . $sidelink->href .   to parser.<br /> ;
    $parse_failed = parseProductsForPage( $sidelink );
    if ( $parse_failed )
    {
        foreach( $parse_failed as $failure )
        {
            $failures[] = $failure;
        }
    }
}

echo count( $failures ) .   pages failed to parse.<br /> ;

echo  <br />FIN!<br /> ; // Easily searched to verfiy end of script was reached, also
                         // celebratory.
ob_end_flush(); // Clear output buffer
flush();
?>
问题回答

您是否确信设定“时间范围”具有任何影响(当操作安全地点时,不会产生任何效果)?

还确保$string_parts = Explorationde( < entitled> ,$link_html_string ); 给出结果(其中不得使用所有权-替代物,或标签Name可使用上等)。

时间：2011-10-28 08:08:53


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