Compare duplicate words and remove them from a string in php

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A string look like this:

 $string = 'Super this is a test this is a test';

Output should be:

Super

I am trying to remove duplicate words completly from a string. What I have found is:

 echo implode(' ',array_unique(explode(' ', $string)));

but here is the output:

 Super this is a test

Thank you for a easy way to do this.

php
2 Answers

That's because array_unique() reduces duplicates to one value:

Takes an input array and returns a new array without duplicate values.
src

You need to loop the array first (though can imagine a lot of creative array_filter/array_walk stuff possibly):

$string = 'Super this is a test this is a test';

# first explode it
$arr = explode(' ', $string);

# get value count as var
$vals = array_count_values($arr);

foreach ($arr as $key => $word)
{
    # if count of word > 1, remove it
    if ($vals[$word] > 1) {
        unset($arr[$key]);
    }
}

# glue whats left together
echo implode(' ', $arr);

fiddle

And as a function for general project-use:

function rm_str_dupes(string $string, string $explodeDelimiter = '', string $implodeDelimiter = '')
{
    $arr = explode($explodeDelimiter, $string);
    $wordCount = array_count_values($arr);

    foreach ($arr as $key => $word)
    {
        if ($wordCount[$word] > 1) {
            unset($arr[$key]);
        }
    }

    return implode($implodeDelimiter, $arr);
}

# example usage
echo rm_str_dupes('Super this is a test this is a test');
user_76110620

You can also use array functions and do this in one line without using foreach.

echo implode(' ', array_keys(array_intersect(array_count_values(explode(' ', $string)),[1])));
user_54265600
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