How do you use define within a heredoc? For example:
define('PREFIX', '/holiday'); $body = <<<EOD <img src="PREFIX/images/hello.png" /> // This doesn't work. EOD; 
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3 Answers
taken from the documentation regarding strings
DEFINE('PREFIX','/holiday'); $const = PREFIX; echo <<<EOD <img src="{$const}/images/hello.png" /> EOD; 
if you have more than 1 constant, variable usage would be difficult. so try this method
define('PREFIX', '/holiday'); define('SUFFIX', '/work'); define('BLABLA', '/lorem'); define('ETC', '/ipsum'); $cname = 'constant'; // if you want to use a function in heredoc, you must save function name in variable $body = <<<EOD <img src="{$cname('PREFIX')}/images/hello.png" /> <img src="{$cname('SUFFIX')}/images/hello.png" /> <img src="{$cname('BLABLA')}/images/hello.png" /> <img src="{$cname('ETC')}/images/hello.png" /> EOD; 
2 Comments
hakre
I followed your suggestion to try that because I thought it is interesting, however it came to my mind that your suggestion looks untested, because it gives many errors.
Ricalsin
(Hmm. Crazy. I would've never....) Any thoughts on speed in comparison to @nbonniot answer: stackoverflow.com/questions/10041200/…
Constants used within the heredoc syntax are not interpreted!
Editor's Note: This is true. PHP has no way of recognizing the constant from any other string of characters within the heredoc block.
1 Comment
hakre
Looks like that there is an exception to that rule: stackoverflow.com/a/12508992/367456