php query_mysql不返回任何内容

i'm trying to delete a row from database and i`m using the following code. When i submit the page reloads and if i check the db the row is still there. No error, no nothing. What can i do to solve this?

HTML

<div class="delete_row">
    Sterge
    <form method="post" action="">
    *<input type="text" name="id_col" Placeholder="Id-ul coloanei"><br>
    <input type="submit" name="submit1" value="Sterge">
    </form>
</div>

PHP

$id_stergere=isset($_POST["id_col"]);
$submitcheck2=isset($_POST["submit1"]);

if($submitcheck2 && $id_stergere !==0 ){
    $sql = "DELETE FROM evenimente WHERE ID_even=$id_stergere";
    $result = query_mysql($sql);
}

if (isset($_POST["id_col"]))
    $id_stergere=$_POST["id_col"];

if (isset($_POST["submit1"]))
    $submitcheck2=$_POST["submit1"];

//additional check:
// if (!is_numeric($id_stergere)) die('there was a problem');
// if (!$submitcheck2) die('there was a problem');

    $sql = "DELETE FROM evenimente WHERE ID_even=".$id_stergere;
    $result = mysql_query($sql);

query_mysql?

Use this for your php :

error_reporting(E_ALL ^ E_NOTICE);

if(isset($_POST['submit1'])){

    $id_stergere=$_POST["id_col"];
    $submitcheck2=$_POST["submit1"];

    if($submitcheck2 && $id_stergere){
        $sql = "DELETE FROM evenimente WHERE ID_even=$id_stergere";
        $result = mysql_query($sql);
    }
}

You should be using mysqli instead though.

Use this instead of the $sql = and $result = :

$link = mysqli_connect("localhost","db","password","user") or die("Error " . mysqli_error($link)); 
$query= "DELETE FROM evenimente WHERE ID_even=$id_stergere";
$result= mysqli_query($link,$query);

To get the numrows use this:

$numrows = $result->num_rows;

For a fetch_array:

while($row = $result->fetch_array()){

      $var= $row['field'];
}

UPDATE: Add error_reporting(E_ALL ^ E_NOTICE); to the top of php script.