'Why' doesn't the script print anything? [duplicate]

Answer 1

Set the content type as text and you can see your output in your browser.

<?php
  header('Content-type: text/plain');
  $var = "<?php echo 'Hey !'; ?>";
  echo $var;
?>

It is because your browser is expecting html and it doesnt understand the php tags you have in the output.

Other wise using htmlspecialchars function would be a better option.

Answer 2

try something like this

$var = '<?php echo \'Hey !\';?>';
echo htmlspecialchars($var);

Answer 3

change this

$var = "<?php echo 'Hey !'; ?>";

into this

$var = "<?php echo 'Hey !'; ?>";

Answer 4

becousing your syntex is wrong for php engine... make change as:

<?php
  $var = "<?php echo 'Hey !'; ?>";
  echo $var;
?>

to

<?php
  $var = 'Hey !';
  echo $var;
?>

Answer 5

It echoes "nothing" because your browser doesn't understand <?php tags, so it won't show the tag contents; it should show something when you select view the page source though.

The reason for this behaviour is that the default content type of your script is set as text/html (you can confirm this by looking at the response headers) and in the context of HTML, you should use htmlspecialchars()

echo htmlspecialchars($var);

In fact, as a general rule, you should always escape variables appropriately when you output them.

Alternatively you could let the browser know that your output should not be interpreted as HTML; you can do this by setting an appropriate response header:

header('Content-Type: text/plain');

With the above content type your output is shown verbatim by the browser.