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Title: Make a search engine for your website with PHP Post by: Daniel Franklin on September 26, 2007, 11:49:00 AM This article introduces every steps of the development, including both design and PHP programming. Basic computer skills and knowledge of HTML fundamentals are required. Ok, let's begin now.
Step 1: Design Search Box Under your website root, make a file called search.htm or anything you like and type in the following code: <html> <head> <title>Web Search</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> </head> <body bgcolor="#FFFFFF" text="#000000"> <form name="form1" method="post" action="search.php"> <table width="100%" cellspacing="0" cellpadding="0"> <tr> <td width="36%"> <div align="center"> <input type="text" name="keyword"> </div> </td> <td width="64%"> <input type="submit" name="Submit" value="Search"> </td> </tr> </table> </form> </body> </html> Step 2: Write search.php file. It is the core of your website search engine. Under your website root, create a file called search.php or anything you like. <?php //get keywords $keyword=trim($_POST["keyword"]); //check if the keyword is empty if($keyword==""){ echo"no keywords"; exit; } ?> With above, you can give hints to your users when they forget to enter a keyword. Now let's go through all the files or articles in your website. <?php function listFiles($dir){ $handle=opendir($dir); while(false!==($file=readdir($handle))){ if($file!="."&&$file!=".."){ //if it is a directory, then continue if(is_dir("$dir/$file")){ listFiles("$dir/$file"); } else{ //process the searching here with the following PHP script } } } } ?> The following scripts read, process files and check whether the files contain $keyword. If $keyword is found in the file, the file address will be saved in an array-type variable. <?php function listFiles($dir,$keyword,&$array){ $handle=opendir($dir); while(false!==($file=readdir($handle))){ if($file!="."&&$file!=".."){ if(is_dir("$dir/$file")){ listFiles("$dir/$file",$keyword,$array); } else{ //read file $data=fread(fopen("$dir/$file","r"),filesize("$dir/$file")); //avoid search search.php itself if($file!="search.php"){ //contain keyword? if(eregi("$keyword",$data)){ $array[]="$dir/$file"; } } } } } } //define array $array $array=array(); //execute function listFiles(".","php",$array); //echo/print search results foreach($array as $value){ echo "$value"." \n"; } ?> Now, combine the programs listed above, you will find all the related results in your websites will be found and listed. A further optimization of the search engine can be taken by adding the following, 1,list the title of all searching results REPLACE THE FOLLOWING if(eregi("$keyword",$data)){ $array[]="$dir/$file"; } WITH if(eregi("$keyword",$data)){ if(eregi("<title>(.+) </title>",$data,$m)){ $title=$m["1"]; } else{ $title="no title"; } $array[]="$dir/$file $title"; } 2,Add links to searching results CHANGE THE FOLLOWING foreach($array as $value){ echo "$value"." \n"; } TO foreach($array as $value){ list($filedir,$title)=split("[ ]",$value,"2"); echo "$value"." \n"; } 3 Set time limit for PHP execution ADD THE FOLLOWING AT THE BEGINNING OF PHP FILES set_time_limit("600"); The above unit is second，so ten minutes is the litmit. Now, combine all the above programs and get the complete search.php file as following, <?php set_time_limit("600"); $keyword=trim($_POST["keyword"]); if($keyword==""){ echo"Please enter your keyword"; exit; } function listFiles($dir,$keyword,&$array){ $handle=opendir($dir); while(false!==($file=readdir($handle))){ if($file!="."&&$file!=".."){ if(is_dir("$dir/$file")){ listFiles("$dir/$file",$keyword,$array); } else{ $data=fread(fopen("$dir/$file","r"),filesize("$dir/$file")); if(eregi("<body([^>]+)>(.+)</body>",$data,$b)){ $body=strip_tags($b["2"]); } else{ $body=strip_tags($data); } if($file!="search.php"){ if(eregi("$keyword",$body)){ if(eregi("<title>(.+)</title>",$data,$m)){ $title=$m["1"]; } else{ $title="no title"; } $array[]="$dir/$file $title"; } } } } } } $array=array(); listFiles(".","$keyword",$array); foreach($array as $value){ list($filedir,$title)=split("[ ]",$value,"2"); echo "$title "." \n"; } ?> Now, you have made a search engine for your website, enjoy it! Articles Source - Free Articles |