CODEWITHSUNDEEP
phparraysfunctionsortingexplode
Hezi-Gangina
Hezi-Gangina

Reputation: 649

PHP: Sort emails by domain

This function works perfectly to sort a list alphabetically and clean all doubles.

function cleanMyList($myFile)
{
    $myTextFile=file_get_contents($myFile);
    $myArray=explode("\r\n",$myTextFile);
    $myArray=array_unique($myArray);
    sort($myArray);
    $myTextFile=implode("\r\n",$myArray);
    return $myTextFile;
}   
echo '<pre>'.cleanMyList('emails.txt').'</pre>';
exit;

This script works just fine but now what I want to do is sort it again by email provider (in other words: by domain) so the list would be sorted twice, First alphabetically and then resort it by email provider.

Here is an example:

emails.txt (before):

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

email.txt after:

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

but I'm expecting to go one step further and get this (sort by domain) :

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

Upvotes: 2

Views: 1738

Answers (2)

Rizier123
Rizier123

Reputation: 59691

This should work for you:

I just changed your code a little bit. First I grab your file with file() where I get ever line as an element in an array where I only take unique values with array_unique(). After this I sort your array with usort() where I check if the domain is the same and if yes then I sort it by the alphabet.

<?php

    function cleanMyList($myFile) {
        $myArray = array_unique(file($myFile, FILE_IGNORE_NEW_LINES));

        usort($myArray, function($a, $b){
            preg_match_all("/(.*)@(.*)\./", $a, $m1);
            preg_match_all("/(.*)@(.*)\./", $b, $m2);

            if(($cmp = strcmp($m1[2][0], $m2[2][0])) == 0) {
                return strcmp($m1[1][0], $m2[1][0]);
            } else {
                return ($cmp < 0 ? -1 : 1);
            }

        });

        return $myTextFile = implode(PHP_EOL, $myArray);
    }

    echo "<pre>" . cleanMyList('emails.txt') . "</pre>";

?>

Output:

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

Upvotes: 2

Rajnikant Sharma
Rajnikant Sharma

Reputation: 606

$em="[email protected],[email protected], [email protected],[email protected]"; Split the emails in two part

$ar=split(",",$em);
while (list ($key, $val) = each ($ar)) {
$ar2=split("@",$val);
echo $ar2[0];
echo "<br>";
echo $ar2[1];
echo "<br><br>";
}

Sort Array (Ascending Order), According to Value - asort()

 <?php
   asort($ar2);
?>
  • asort() - sort associative arrays in ascending order, according to the value
  • ksort() - sort associative arrays in ascending order, according to the key
  • arsort() - sort associative arrays in descending order, according to the value
  • krsort() - sort associative arrays in descending order, according to the key

Upvotes: 0

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