Using PHP variables inside HTML tags?

I am pretty new to php but I'm stuck on this problem... Say i wait to put a link to another site with a given parameter, how do I do it correclty?

This is what i have now:

<html>
<body>
<?php
  $param = "test";

  echo "<a href="http://www.whatever.com/$param">Click Here</a>;
?>

</body>
</html>

Solution 1:

Well, for starters, you might not wanna overuse echo, because (as is the problem in your case) you can very easily make mistakes on quotation marks.

This would fix your problem:

echo "<a href=\"http://www.whatever.com/$param\">Click Here</a>";

but you should really do this

<?php
  $param = "test";
?>
<a href="http://www.whatever.com/<?php echo $param; ?>">Click Here</a>

Solution 2:

You can do it a number of ways, depending on the type of quotes you use:

echo "<a href='http://www.whatever.com/$param'>Click here</a>";
echo "<a href='http://www.whatever.com/{$param}'>Click here</a>";
echo '<a href="http://www.whatever.com/' . $param . '">Click here</a>';
echo "<a href=\"http://www.whatever.com/$param\">Click here</a>";

Double quotes allow for variables in the middle of the string, where as single quotes are string literals and, as such, interpret everything as a string of characters -- nothing more -- not even \n will be expanded to mean the new line character, it will just be the characters \ and n in sequence.

You need to be careful about your use of whichever type of quoting you decide. You can't use double quotes inside a double quoted string (as in your example) as you'll be ending the string early, which isn't what you want. You can escape the inner double quotes, however, by adding a backslash.

On a separate note, you might need to be careful about XSS attacks when printing unsafe variables (populated by the user) out to the browser.

Using PHP variables inside HTML tags?

Solution 1:

Solution 2:

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