Control not entering if(isset())) - php

Question

Below is the html code for my form and the php code which i am using to pass data to a class method.Now the problem that i have is that the control does not seem to enter the if loop which i concluded by testing as you can see."test0" gets printed but "test1" and other subsequent "tests" do not get printed.
<form action="" method="post" enctype=multipart/form-data>
<div class="form-group">
<label for="job name">Job name:</label>
<input type="text" class="form-control" id="jobnm" value="<?php echo $_GET['jobnm'];?>" disabled>
</div>
<div class="form-group">
<label for="name">Name:</label>
<input type="text" class="form-control" name="name" required>
</div>
<div class="form-group">
<label for="email">Email address:</label>
<input type="email" class="form-control" name="mail" required>
</div>
<div class="form-group">
<label for="phone">Enter a phone number:</label><br><br>
<input type="tel" id="phone" name="phone" placeholder="[phone]" pattern="[0-9]{10}" required><br><br>
<small>Format: 1234567890</small><br><br>
</div>
<label >Gender</label>
<div class="radio">
<label><input type="radio" name="optradio" value="m">Male</label>
</div>
<div class="radio">
<label><input type="radio" name="optradio" value="f">Female</label>
</div>
<div class="radio">
<label><input type="radio" name="optradio" value="o">Other</label>
</div>
<div class="custom-file">
<input type="file" class="custom-file-input" name="cvFile" required>
<label class="custom-file-label" for="customFile">Upload resume</label>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
<button type="reset" class="btn btn-danger" >Reset</button>
</form>
<?php
require_once 'db-config.php';
require_once 'classCandi.php';
echo "test0";
if(isset($_POST['submit']))
{
echo "test1";
$jobID = $_GET['jobid'];
echo "test2";
$canName = $_POST['name'];
$canEmail = $_POST['mail'];
$canPhone = $_POST['phone'];
$canRadio = $_POST['optradio'];
echo "test3";
//Upload file
$fnm = "cv/";
$cvDst = $fnm . basename($_FILES["cvFile"]["name"]);
move_uploaded_file($_FILES["cvFile"]["tmp_name"],$cvDst);
echo "test4";
$obj = new Candi($conn);
$obj->storeInfo($jobID,$canName,$canEmail,$canPhone,$canRadio,$cvDst);
echo "test5";
echo '<script language="javascript">';
echo 'alert("Submitted");';
echo '</script>';
echo "test6";
}

Answer 1

The below code won't be true anytime! It's because you didn't understand how $_POST works.
if(isset($_POST['submit']))
There's no input element in your frontend that has name="submit". And to see, there's none of the inputs have name attribute at all.
Instead, the better way to do is, understand how this works and change your code so that, it includes:
a name attribute for all the input and form elements.
a check on the values and not $_POST['submit']
And finally...
don't copy and paste without understanding the code.
don't check on $_POST['submit'] truthness.
Example, for $canName = $_POST['name']; to work, you need to have:
<input type="text" name="name" id="name" value="<?php echo $something; ?>" />
// ^^^^^^^^^^^
And have your attribute and values in quotes please:
enctype="multipart/form-data"
// ^ ^