4a1.php
<?php

if (isset($_POST['request']) && !empty($_POST['request'])) {

    $raspunsuri = $_POST['request'];

    // array cu raspunsuri corecte
    // poate pare alambicat, dar are avantaje fiind asa
    $return_arr = array(
        "d011@1",
        "d021@2,3,4",
        "d023@5,6,7,8",
        "d024@-"
    );

    $wrong = array();

    for ($i = 0; $i < count($return_arr); $i++) {
        if ($return_arr[$i] != $raspunsuri[$i]) {


            $xy = substr($raspunsuri[$i], 0, strpos($raspunsuri[$i], "@"));


            $wrong[] = "#" . $xy;
        }
    }


    $returnat=0;
    echo implode(', ', $wrong);
}
?>






4a2.php
<?php

if (isset($_POST['request']) && !empty($_POST['request'])) {

    $raspunsuri = $_POST['request'];

    // array cu raspunsuri corecte
    // poate pare alambicat, dar are avantaje fiind asa
    $return_arr = array(
        "d011@1,2",
        "d021@3,4",
        "d023@5,6,7,8",
        "d024@-"
    );

    $wrong = array();

    for ($i = 0; $i < count($return_arr); $i++) {
        if ($return_arr[$i] != $raspunsuri[$i]) {


            $xy = substr($raspunsuri[$i], 0, strpos($raspunsuri[$i], "@"));



            $wrong[] = "#" . $xy;
        }
    }


    $returnat=0;
    echo implode(', ', $wrong);
}
?>