Can you see if my codes are working? My computer can't tell me the php results

<PLEASE USE THIS TEMPLATE TO HELP YOU CREATE A GREAT POST!>
Sorry about all of this, but my computer hasn’t been allowing me to see the outcome of my PHP codes because of my server. So I was wondering if y’all would check them and tell me which ones are correct and which ones are wrong? And if you know what’s wrong? Thank you.

<Below this line, add a link to the EXACT exercise that you are stuck at.>

<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>

``` //Code 1
<!DOCTYPE html>
<html>
<body>
<h1>Fibonacci Series running PHP</h1>
<?php
$num_1 = 1;
$num_2 = 1;
$next_value = 1;
echo "The first value is " .$num_1. "<br>";
echo "The second value is " .$num_2. "<br>";
for($i=0;$i<20;$i++){
$next_value = $num_1 + $num_2;
echo "<br>The next value is: " .$next_value;
$num_1 = $num_2;
$num_2 = $next_value;
}
?>
</body>
</html>

//Code 2

<!DOCTYPE html>
<html>
<body>
<h1>Fibonacci While PHP</h1>
<?php
$i = 1;
$num_1 = 1;
$num_2 = 1;
$next_value = 0;
echo "The first value is " .$num_1. "<br>";
echo "The second value is " .$num_2. " ";
do { 
$next_value = $num_1+$num_2;
echo "<br>The next value is: " .$next_value;
$num_1 = $num_2;
$num_2 = $next_value;
$i++;
} while ($i <= 10);  
?>
</body>
</html>

//Code 3

<!DOCTYPE html>
<html>
<body>
<h1>Factorial For Loop PHP</h1>
<?php
$userInput = 11;
$num_1 = 1;
$num_2 = 1;
$next_value = 1;
echo "The first value is " .$num_1. "<br>";
echo "The second value is " .$num_2. "<br>";
$num_1 = $userInput;
$num_2 = $num_1 - 1;
for($i=0;$i<10;$i++){
$next_value = $num_1 * $num_2;
echo "<br>The next value is: " .$num_2;
$num_2 = $num_2 - 1;
$num_1 = $next_value;
}
?>
</body>
</html>

//Code 4

<!DOCTYPE html>
<html>
<body>
<h1>Factorial PHP</h1>
<?php
$userInput = 10;
$factorial = 1;
$num_1 = 1;
$num_2 = 1;
echo "The first value is " .$num_1. "<br>";
echo "The second value is " .$num_2. "<br>";
do {	
$factorial = $factorial * $userInput;
echo "<br>The next value is: " .$userInput;
$userInput--;
} while ($userInput >= 1);  
?>
</body>
</html>

//Code 5

//Code 6

<!DOCTYPE html>
<html>    <!DOCTYPE html>
<html>
<body>
<h1>Header Sizes For Loop PHP</h1>
<?php
for($i = 1; $i <= 4; $i++) { 
echo "<h$i>header</h$i>"; 
}
for($i = 5; $i >= 1; $i--) { 
echo "<h$i>header</h$i>"; 
}
?>
</body>
</html>

<body>
<h1>Header Sizes While Loop PHP</h1>
<?php 
$x = 1;
do {
echo "The number is: $x <br>";
$x++;
} while ($x <= 5);
?>
</body>
</html>

//Code 7

Header Sizes While Loop PHP

<?php $x = 1; do { echo "Hello World".""; $x++; } while ($x <= 4; $x++); $x = 5; do { echo "Hello World".""; $x++; } while ($x >= 5; $x--); ?> ```

You can test your code at phpfiddle.org online

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