Put elements from post php into an array and then in a table Mysql

I have tryed many things.. need simply to retriev values posted from another page put in array and then add the values to a table with unique name

<?php
$f1 = $_POST['f1'];

$f2 = $_POST['f2'];

$f3 = $_POST['f3'];

....

$f5 = $_POST['f100'];

$Array = array()

 for (i=0;i<100;i++){
 $Array = $f[i]
 }

then

 for(i=0;i<sizeof($Array);i++){
  $sql = "INSERT INTO `current stock` (ItemNumber, Stock)
           VALUES
          (Itam1, 'Array[i]' )";
  }

  ?>

Answer

Try something like this ($_POST is an array allready, as mentioned by @EL_Vanja):

// Some random values, for demonstration...
$_POST['f1'] = 12;
$_POST['f2']  ="string";
$_POST['f3'] = 12.12;
$_POST['f100'] = rand(0,10);


$array = [];
foreach($_POST as $key => $value) {
 $array[$key] =$value;
 }
print("<pre>".print_r($array,true)."</pre>");

will printout:

<pre>
Array
(
    [f1] => 12
    [f2] => string
    [f3] => 12.12
    [f100] => 6
)
</pre>

And for the query part:

$sql = "INSERT INTO `current stock` (ItemNumber, Stock) VALUES ";
$lastElement = end($array);
$i = 1;
foreach($array as $arr){
    if($arr == $lastElement) {
        $separator = ";";
    } else {
         $separator = ",";
    }
    
    $sql .= "(Item".$i.", $arr)". $separator;
    $i++;

}
print_r($sql);

And the query will look like:

INSERT INTO `current stock` (ItemNumber, Stock) VALUES (Item1, 12),(Item2, string),(Item3, 12.12),(Item4, 7);