Display php code with fwrite inside a php file

Question

Hello i am using the code bellow to write the following line inside a .php file.

$stringDatar = "<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML+RDFa 1.0//EN'\n";
fwrite($handler, $stringDatar);

I am trying to do the same to write inside a php file with the following code but it doesn't wite the php code.

$stringDatar = "'.<?php $_GET['p']\n.'";
fwrite($handler, $stringDatar);

Any ideas?

how are you calling fopen, is $handler a resource, or does the fopen call fail? What mode is the handle in (a, w, ...?) any specific errors/warnings (turn display_errors on, and set the error_reporting to the maximum setting (E_STRICT|E_ALL). You're also doing weird things with the dots (concat operator). To concatenate string, the . shouldn't be inside the quotes: $foo = 'a string'; $foo = '.rest'; reassings $foo, to concatenate: $foo .= 'rest'; (note .=) or $foo = $foo . 'rest'; It's basic syntax — Elias Van Ootegem
– Elias Van Ootegem, Commented Aug 3, 2015 at 9:56

Barmar · Accepted Answer · 2015-08-03 10:01:13Z

1

Variables are expanded inside double quotes, so it's putting the value of $_GET['p'] into the file. You need to escape the dollar sign so it will be written literally.

$stringDatar = "'.<?php \$_GET['p']\n.'";

answered Aug 3, 2015 at 10:01

Barmar

789k57 gold badges554 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Daniel Krom · Accepted Answer · 2015-08-03 10:11:39Z

1

you can use this format which might be more more comfortable

<?php

$content = <<< END
<?php
  \$d = 5;
  echo "\$d".PHP_EOL;
  echo \$_GET['arg'];

END;
file_put_contents("filename.php", $content);

fileContents:

<?php
  $d = 5;
  echo "$d".PHP_EOL;
  echo $_GET['arg'];

edited Aug 3, 2015 at 10:11

answered Aug 3, 2015 at 10:02

Daniel Krom

10.1k3 gold badges47 silver badges45 bronze badges

3 Comments

Elias Van Ootegem Over a year ago

Personally, I'd also advise against using "\n" in favor of the predefined PHP_EOL constant

Daniel Krom Over a year ago

ok, but it's just an example, you can also say that $d is not a good variable name, doesn't matter for the example (:

Elias Van Ootegem Over a year ago

Sure, just added the comment for completeness -> the OP is clearly in the early stages of learning, so I figured it's best to expose them to code that shows "best practices" as much as possible... there's a ton of crap-code out there already (not saying your answer is crap, just saying that many tutorials contain bad code examples)

Collectives™ on Stack Overflow

Display php code with fwrite inside a php file

2 Answers 2

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related