我将如何比较两个文本文件匹配与PHP

Question

$domains = file('../../domains.txt'); 
$keywords = file('../../keywords.txt'); 

$域将在格式：

3kool4u.com,9/29/2013 12:00:00 AM,AUC 
3liftdr.com,9/29/2013 12:00:00 AM,AUC 
3lionmedia.com,9/29/2013 12:00:00 AM,AUC 
3mdprod.com,9/29/2013 12:00:00 AM,AUC 
3mdproductions.com,9/29/2013 12:00:00 AM,AUC 

关键字将在格式：

keyword1 
keyword2 
keyword3 

我想我会真的很想为文件中的关键字做一个数组，并搜索每一行domains.txt中的匹配项。不知道从哪里开始，因为我对preg_match，preg_match_all和strpos的差异感到困惑，并且多少会在何时使用另一个。

非常感谢您的帮助。

Answer 1

//EMPTY array to hold each line on domains that has a match 
$matches = array(); 

//for each line on the domains file 
foreach($domains as $domain){ 

    //for each keyword 
    foreach($keywords as $keyword){ 

      //if the domain line contains the keyword on any position no matter the case 
      if(preg_match("/$keyword/i", $domain)) { 
        //Add the domain line to the matches array 
      $matches[] = $domain; 
      }  
    } 
} 

现在你有$匹配阵列相匹配的关键字的

注意到，与以前的方法的两个的整个文件加载到内存中，并且根据所访问的文件中的所有行文件大小可以运行内存不足或OS将开始使用比RAM

慢得多，这是另一个和更有效的方法，可以加载一行交换，如果该文件的时间。

<?php 

// Allow automatic detection of line endings 
ini_set('auto_detect_line_endings',true); 

//Array that will hold the lines that match 
$matches = array(); 

//Opening the two files on read mode 
$domains_handle = fopen('../../domains.txt', "r"); 
$keywords_handle = fopen('../../keywords.txt', "r"); 

    //Iterate the domains one line at the time 
    while (($domains_line = fgets($domains_handle)) !== false) { 

     //For each line on the domains file, iterate the kwywords file a line at the time 
     while (($keywords_line = fgets($keywords_handle)) !== false) { 

       //remove any whitespace or new line from the beginning or the end of string 
       $trimmed_keyword = trim($keywords_line); 

       //Check if the domain line contains the keyword on any position 
       // using case insensitive comparison 
       if(preg_match("/$trimmed_keyword/i", trim($domains_line))) { 
        //Add the domain line to the matches array 
       $matches[] = $domains_line; 
       } 
     } 
     //Set the pointer to the beginning of the keywords file 
     rewind($keywords_handle); 
    } 

//Release the resources 
fclose($domains_handle); 
fclose($keywords_handle); 

var_dump($matches);