Compare domains that read from file in php

Question

I have a txt file which contains domains and ips looks like this

aaa.bbb.com 8.8.8.8
bbb.com 2.2.2.2
...
...
..

How do I replace bbb.com to 3.3.3.3 but do not change aaa.bbb.com?

Here is part of my function, but not working at all.

First part I search for the match domain by reading it line by line from file
after I got the matched record ,delete it.
Second part I write a new line into it.

    $filename = "record.txt";
    $lines = file($filename);

    foreach($lines as $line) 
    if(!strstr($line, "bbb.com") //I think here is the problem core
    $out .= $line;

    $f = fopen($filename, "w");
    fwrite($f, $out);
    fclose($f);



    $myFile = "record.txt";
    $fh = fopen($myFile, 'a') or die("can't open file");
    $stringData = "bbb.com\n 3.3.3.3\n";
    fwrite($fh, $stringData);
    fclose($fh);

after I execute my code, both aaa.bbb.com and bbb.com were deleted, how can I solve this issue?

I've try "parse_url" but "parse_url" only parse url with "http://" prefix instead of a domain.

Answer 1

Well, sorry for the misunderstanding, this should work:

<?php

$file = "record.txt";
$search = "bbb.com";
$replace = "3.3.3.3";

$open = file_get_contents($file);
$lines = explode(PHP_EOL, $open);
$dump = "";
foreach($lines as $line){
    $pos = strpos($line, $search);
    if($pos === false){
    echo "<b>$line</b>";
        $dump .= $line.PHP_EOL;
    }else{
        if($pos !== 0){
            $dump .= $line.PHP_EOL;
        }else{
            $dump .= $search." ".$replace.PHP_EOL;
        }
    }
}
$dump = substr($dump,0,-1);
file_put_contents($file, $dump);

?>