Email address duplicates

[_tina_]

Hi,

 

I have an array of email addresses, I'm trying to figure out how to check for duplicates.

 

I have read various form posts on the topic but can't seem to get anything that works for me.  Does anybody have any experience with this?

 

Thanks in advance!

[Andy-H]

Look into the array_unique function

[ChemicalBliss]

Yup, my method is too loop through the array and check it manually one by one:

 

Theory =

 

Start Array with Duplicates

Create new array (for this purpose ill name it "NewArray").

Loop through each item of Start Array, and add it to NewArray as long as it doesnt exist.

Then your left with a new array.

 

An Example: (UNTESTED)

<?php

$Array = array(
"someemail@test.com",
"email@test.com",
"test@email.com",
"someemail@test.com",
"test@someemail.com"
);

$nArray = array();

for($i=0;$i<count($Array);$i++){
if(!isset($nArray[$Array[$i]])){
	$nArray[$Array[$i]] = count($nArray) - 1;
}

}
$nArray = array_flip($nArray);

?>

 

Hope this helps,

-CB-

[Andy-H]

<?php
$array  = array(
"someEmail@test.com",
"email@test.com",
"test@email.com",
"someemail@test.com",
"test@someemail.com"
);

$array  = array_map("strtolower", $array);
$unique = array_unique($array, SORT_STRING);

echo '<pre>' . "\n\tStart array:\n\n" . print_r($array, true) . "\n\n" . '</pre>';
echo '<pre>' . "\n\tUnique array:\n\n" . print_r($unique, true) . '</pre>';
?>

 

 

Output:

Start array:

Array
(
    [0] => someemail@test.com
    [1] => email@test.com
    [2] => test@email.com
    [3] => someemail@test.com
    [4] => test@someemail.com
)


Unique array:

Array
(
    [0] => someemail@test.com
    [1] => email@test.com
    [2] => test@email.com
    [4] => test@someemail.com
)

[ChemicalBliss]

Aw lol who will he go for?

[PFMaBiSmAd]

To actually check for and find duplicates you would want to use array_count_values

[_tina_]

Thanks for all the replies guys.  This is a huge help.

 

Thanks again