I HAVE NO IDEA HOW TO SOLVE THIS

<main>

<?php

//Define $text to use in form

if(isset($_POST['translate'])){

    $text = $_POST['text'];

}else{

    $text = '';

}

?>

    <form action="" method="post">

        <textarea name="text" placeholder="Type text to be translated"><?php echo $text ?></textarea><br>

        <input type="submit" name="translate" value="translate">

    </form>

<?php

//predefine empty variables and arrays

$stringArray = [];

$allKeys = [];

$allTranslate = [];

$keys = [];

$translate = [];

$dbArr = [];

$finArray =[];

//explode input $text into array $stringArray

$stringArray = explode(' ', $text);

//If languages are specified, add those to the query, if not take Faroese and English as default

if(isset($_GET['langone']) && isset($_GET['langtwo'])){

    $sql = "SELECT one.word as word, two.word AS trans_to
        FROM words one
        INNER JOIN words two
        ON one.numberInLang = two.numberInLang
        WHERE one.numberInLang = two.numberInLang
        AND one.languageId = {$_GET['langone']}
        AND two.languageId = {$_GET['langtwo']};";

}else{

    $sql = "SELECT one.word as word, two.word AS trans_to
        FROM words one
        INNER JOIN words two
        ON one.numberInLang = two.numberInLang
        WHERE one.numberInLang = two.numberInLang
        AND one.languageId = 1
        AND two.languageId = 2;";

}

//Send query to database

$translateQuery = $con->query($sql);

//take the whole database and put it into two arrays, $allKeys and $allTranslate

while($trans = $translateQuery->fetch_object()){

    $allKeys[].= $trans->word;

    $allTranslate[].= $trans->trans_to;

}

//Figure out what input does not exist in $allTranslate and output it

foreach($stringArray as $value){

    if(!in_array($value, $allTranslate)){

        echo "{$value}<br>";

    }

}

//Put $allKeys as key in $dbArr and $allTranslate as value in $dbArr

for($i = 0; $i <= count($allTranslate); $i++) {

    $dbArr[$allKeys[$i]].= $allTranslate[$i];

}

    echo '<br><br>stringArray<pre>';
    var_dump($stringArray);
    echo '</pre>';

    echo 'dbArr<pre>';
    var_dump($dbArr);
    echo '</pre>';


if(isset($_POST['translate']) && $text == ''){

    echo "You haven't typed anything";

}elseif($text == ''){

    echo "No entry";

}

?>

</main>