checking users html form info with PHP on same page - php

Question

I am trying to write a simple html form which requires the user to enter the correct email and password, using $_SERVER as the action for my form. I do not want to send the POST info to another php page, but I want to do it on the same page instead.
I have set two variables, $correct_email and $correct_password.
Here is the form;
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
<label for="eml">Email:</label>
<input type="email" name="eml" id="eml" required>
<br>
<label for="pwd">Password:</label>
<input type="password" name="pwd" id="pwd" required>
<br>
<input type="hidden" name="checkMe" value="12345">
<input type="submit" name="submit" value="Submit">
</form>
Here is what I am trying to get work in PHP
$correct_email = "(my personal email)";
$correct_password = "password"];
if ($_POST['eml']) == $correct_email && ($_POST['pwd']) == $correct_password {
echo "<h1>You are logged in</h1>";
} else {
echo "<h1>error</h1>";
}
It is not working, please help! I am also unclear on whether the PHP should come before or after the form.
Also, I would like to have the form be cleared from view, on the page, when the correct info is entered.
Thanks so much

Answer 1

Change the name of the submit button - never call anything "submit" in a form
Put the test at the top
You had issues with the ( and ) in the test
Also an issue with a ] after "password"
<?php
if ($_POST["subBut"] === "Submit") {
$correct_email = "(my personal email)";
$correct_password = "password";
if ($_POST['eml'] == $correct_email && $_POST['pwd'] == $correct_password) {
echo "<h1>You are logged in</h1>";
} else {
echo "<h1>error</h1>";
}
}
else {
?>
<form method="post" action="<?php echo htmlspecialchars($_SERVER[" PHP_SELF "]); ?>">
<label for="eml">Email:</label>
<input type="email" name="eml" id="eml" required>
<br>
<label for="pwd">Password:</label>
<input type="password" name="pwd" id="pwd" required>
<br>
<input type="hidden" name="checkMe" value="12345">
<input type="submit" name="subBut" value="Submit">
</form>
<?php } ?>