Reputation: 111
How to display PHP code on HTML page in browser?
How can I write PHP code in PHP? I want to do this, but it doesn't work:
<?php echo '<?php echo \'aoeu\'; ?>'; ?>
Hope someone can give me a hint,
Many thanks
Upvotes: 9
Views: 15986
Answers (14)
Reputation: 4251
In your case, you should user htmlspecialchars instead of htmlentities - htmlspecialchars is just lighter - htmlspecialchars will only convert special characters (that may cause problems in the rendering of the HTML) to their HTML entity equivalent, such as >, <, single/double quotes.
htmlspecialchars will convert all characters that have an HTML entity equivalent, such as á, é, etc...
Both will work, and the lazy (non-efficient) decision is to just always use htmlentities without considering the context of the code.
Upvotes: 0
Reputation: 981
As a summary of many answers here you can echo o print php and html code by changing all special characters to its correspondent html special codes. Al least all '<' chars in string should be converted to '<'. There are many ways of doing this:
echo htmlspecialchars("<b>\"á'");
>> <b>"á'
This converts all characters needed for echoing code.
echo htmlentities("<b>\"á'");
>> <b>"á'
This does the same as htmlspecialchars but also converts all characters that have corresponding html codes.
Something worth noting is that single and double quotes have a different behavior as single quotes do not interpret variables inside them nor read escaped characters as such (except the single quote itself).
$foo = "value";
echo "I replace $foo with value and \n with line break";
>> I replace value with value and
with line break
echo 'I don\'t replace $foo with value nor \n with line break';
>> I don't replace $foo with value nor \n with line break
Also you could use heredoc syntax, that is equal as a double-quoted string but you don't need to escape them inside the string
echo <<<EOF
Your "string' here
EOF;
Or nowdoc syntax wich is the same but imitates a single-quoted string
echo <<<'EOF'
Your "string' here
EOF;
You can read all about these here: https://www.php.net/manual/es/language.types.string.php
Upvotes: 0
Reputation: 538
You can use highlight_string or highlight_file if you use highligh_file you have to indicate php file that you want to show
<?php
highlight_string('<?php echo\'hello\' ?>');
highlight_file("D:\local\ajax_bottom.php");
?>
or you can combine both which the best solution for me:
<?php
$string=highlight_file("D:\local\hatirlaticilar\Adminn\autocomplete\gethint.php");
highlight_string("$string");
?>
or you can combine in a different way:
<?php
highlight_string(highlight_file("D:\local\hatirlaticilar\Adminn\autocomplete\gethint.php"));
?>
Upvotes: 2
Reputation: 42
echo '<div class="row"><div class="col-md-6 col-md-offset-3"><div class="alert alert-success" role="alert"><p style="text-align: center;">'. php code goes here .'</p></div></div></div>';
Upvotes: -1
Reputation: 4102
I'm unsure what the php engine needs (I'll take other poster's words for it that htmlentities works), but using vim the ?> at the end will make it look like the php code section has ended.
Instead I just do this:
string = "<? echo somefunc('strparam'); ?" . ">";
Editor is happy. If there is a better way of doing this, let me know!
Upvotes: 0
Reputation: 9357
Example 1
<?php echo '<pre>', highlight_string('<?php
include($_SERVER["DOCUMENT_ROOT"] . "/myclass/myform.php");
?>', true), '</pre>'; ?>
Example 2
See php manual highlight-string
Upvotes: 0
Reputation: 1260
This cannot be done directly in the way that you posted.
PHP is a server side scripting language as I am sure you know. This means it is executed before the page is shown to the user.
In effect, your code is writing the text to the browser, but not to the server. The only way to execute php code generated by other php code would be to write the new code to a file, then run the file once the page loads.
Upvotes: 0
Reputation: 96258
If you output some complex code definitely use a template engine like smarty.. otherwise your code will look a complete mess.
I once patched the propel ORM which does output PHP code without using a template engine. It generates all the model classes based on the XML configuration files. Their code was a big mess. Don't do it.
Upvotes: 3
Reputation: 11175
I am assuming you're trying to show the <?php ?> tags? If so, just use < instead of <
Upvotes: 0
Reputation: 6052
Try This
<<< is Heredoc
<?php
echo <<< EOF
<?php
echo <<< EOF
EOF;
?>
EOF;
?>
Upvotes: 2
Reputation: 747
<?php echo '<?php echo \'aoeu\'; ?>'; ?>
If you don't escape the '<' and '>' they will be printed as html tags.
Upvotes: 2
Reputation: 50976
<?php echo htmlspecialchars('<?php echo \'aoeu\'; ?>'); ?>
http://sandbox.phpcode.eu/g/b1316.php
Upvotes: 0
Reputation: 163232
Escaping the string is all you need to do. You have done it correctly. Unless of course you are outputting for HTML, then use htmlspecialchars().
Upvotes: 0
