<?php
 
function findCoincidences($textOfArray) {
    $output = "";
 
    // Locate all the duplicated Strings (keys and values)
    preg_match_all('/".*?"/', $textOfArray, $matches);
 
    // Make array where key = string, and value = repetitions
    $arrayCoinc = array_count_values($matches[0]);
 
    $output = "==== COINCIDENCES  ====<br>";
    foreach ($arrayCoinc as $k => $v){
        if ($v > 1){
            $output .= "<b>".$k."</b> Found:".$v."<br>";
        }
    }
    return $output;
}
 
$array1 = '$array = ["hello"=>1, "hello"=>2,];';
 
echo findCoincidences($array1);
 
// your code goes here

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