string processing

imnu

I need to merge two email lists (text files). There are many duplicate emails. Is it possible to write a php script to remove the duplcates on the merged list.

Thanks a lot.

LordShryku

Are these just one email address per line? If so, read the files using [man]file[/man] into one array, then use [man]array_unique[/man] to kill duplicates

imnu

Thanks. It works in someway but how do I get the output I want? I used print_r to see the output. What I got was one line with many keys like [1] => in between emails. Please help. This is my code:

$address = file("list.txt");
$address1 = array_unique($address);
print_r($address1);

LordShryku

How are the addresses stored in the file?

imnu

Thanks. One address per line. I found a function on web (http://www.planet-source-code.com/URLSEO/vb/scripts/ShowCode!asp/txtCodeId!1184/lngWid!8/anyname.htm) it works with a little modification. But still like to see if there is a simple way. Here is the code:


$address = file("list.txt");
$address1 = array_unique($address);

function LIST_CONTENTS($arrayname,$tab="    ",$indent=0) {
   while(list($key, $value) = each($arrayname)) 
    { 
    for($i=0; $i<$indent; $i++) $currenttab .= $tab; 
    if (is_array($value)) 
    { 
    $retval .= "$currenttab$key : Array: <BR>$currenttab{<BR>"; 
    $retval .= LIST_CONTENTS($value,$tab,$indent+1)."$currenttab}<BR>"; 
    } 
    else $retval .= "$value<br>"; 
    $currenttab = NULL; 
    } 
    return $retval; 
   }
echo LIST_CONTENTS($address1,$tab="", $indent=0);

Weedpacket

$address = file("list.txt");
$address = array_unique($address); 
$address = join("\n",$address);
$fp = fopen('list.txt','w');
fwrite($fp, $address);
fclose($fp);

Assuming you want the uniquified list to overwrite the original list. Change the file that's opened otherwise.