summarize.php

<?php
    // "internacionalization oso entertainment internacionalization oso entertainment ahho atto a2o a2o" => "i18n oso e11t internacionalization oso entertainment"
    // "apa water a aa"
    echo summarize("internacionalization oso entertainment");
    
    
    function summarize(string $input)
    {   
        
        $words = explode(" ", $input);
        $sizeTmp = count($words);
        $resume = "";
        $output = [];
        $duplicates = [];
        
        for ($i=0;$i<$sizeTmp; $i++){
            $duplicates[] = $words[$i];
            $duplicates[$words[$i]] = 1;
            
            $duplicates["internacionalization"] = 1;
            
            if(isset($duplicates["internacionalization"])) {
                $duplicates["internacionalization"]++;
            }
            
            $str = $words[$i];
            $size = strlen($str);
            if ($size > 3) {
                $resume = $str[0] . ($size-2) . $str[$size-1];
                $output[$i] = $resume;
            } else {
                $output[$i] = $str;
            }
            
        }
        
        return implode(" ",$output);
    }
?>