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@ 2023-01-04T16:12:16Z

<?php

$array_words = ['harmony', 'Acrobat', 'harmony', 'harmony'];
$array_words_unique = array_unique($array_words); //get a list of unique words from the original array
$array_str = implode(",", $array_words);

foreach ($array_words_unique as $word) {
    //count how many times the word occurs
    $count = substr_count($array_str, $word);
    
    //if it occurs more than once, remove the first occurence
    if ($count > 1) {
        //find the first position of the word in the string, then replace that with nothing
        $pos = strpos($array_str, $word); 
        $array_str = substr_replace($array_str, "", $pos, strlen($word));
    }
}

//convert back to an array, and filter any blank entries caused by commas with nothing between them
$array_final = array_filter(explode(",", $array_str));

var_dump($array_final);

Output for git.master, git.master_jit, rfc.property-hooks: array(3) { [1]=> string(7) "Acrobat" [2]=> string(7) "harmony" [3]=> string(7) "harmony" }

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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