Question

下面是我的脚本，显示错误$csvfileoutput是未定义的变量。正如我已经定义了这个变量。

define('CSV_PATH','/var/www/Scripts/csvfiles/');
$csv_fileoutput = CSV_PATH . "top_selling_Category_output_.csv";
$csvfileoutput  = fopen($csv_fileoutput, 'w');
fputcsv($csvfileoutput, array('Part URL'));

$website= "https://www.website.com";

function scrapurls($val, $tagname, $attribute,$value){
        $html = file_get_contents($val);
        $dom = new DOMDocument();
        $dom->loadHTML($html);
        $links = array();
        $equivalentparts = array();
        $divs = $dom->getElementsByTagName($tagname);
        foreach($divs as $div) {
          $cl = $div->getAttribute($attribute);
          if ($cl == $value) {
                //echo "\nID: ".$cl;
            $hrefs = $div->getElementsByTagName("a");
            foreach ($hrefs as $href){
               $links[] = $href->getAttribute("href");
               $equivalentparts[] = $href->nodeValue;               
               }
          }
        }
       array_walk($links, function (&$value, $key) { $value="https://www.website.com$value"; });
       return(array_unique($links));
}

$urls = array();
$urls = array('https://www.website.com/topsellers/?vertical=3');
foreach ($urls as $val){
        $pageinateurl = array($val);
        findpagesurls($val);
     }

function findpagesurls($val){
         $pageinateurl = array();
         $pageinateurl = scrapurls($val, "div","style", "display: inline-block;");
         echo "\nPage 1: Total Urls - ".count($pageinateurl) . "\n\n"; 
         foreach ($pageinateurl as $produrl){ 
                scrapdata($produrl); 
        }
}
function scrapdata($producturl) {
        $producturl = trim($producturl); 
        echo $producturl . "\n";   
        fputcsv($csvfileoutput, array($producturl));
    }

?>

Answer 1

在函数scrapdata中，未定义此变量。阅读变量范围。

http://php.net/manual/en/language.variables.scope.php

最好的解决方案是将此变量作为参数

发送到此函数

Answer 2

查看变量http://php.net/manual/en/language.variables.scope.php

的范围

<?php
  $a = 1; /* global scope */ 

  function test()
  { 
    echo $a; /* reference to local scope variable */ 
 } 

 test();
 ?>

Answer 3

HotFix，但你不应该这样做。在函数内部访问全局变量并不好。

function scrapdata($producturl) {
        global $csvfileoutput;
        $producturl = trim($producturl); 
        echo $producturl . "\n";   
        fputcsv($csvfileoutput, array($producturl));
}

应该是。

function scrapdata($producturl,$csvfileoutput) {
        $producturl = trim($producturl); 
        echo $producturl . "\n";   
        fputcsv($csvfileoutput, array($producturl));
}

php函数中的Undefiend变量

3 个答案: