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Queue on 06/20/14

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Last Edited at 06/20/14 09:02am

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Using functions / expressions in HEREDOC strings

/ Published in: PHP

use anonymous function that returns parameter passed to it to evaluate functions, constants, and expressions in HEREDOC

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// anonymous function
$echo = function($param) {
 
  return $param;
};
 
$test = <<<HEREDOC
\$echo is now a generic function that can be used in all sorts of ways:
Output the result of a function: {$echo(date('r'))}
Output the value of a constant: {$echo(__FILE__)}
Static methods work just as well: {$echo(MyClass::getSomething())}
2 + 2 equals {$echo(2+2)}
HEREDOC;
 
echo $echo(test);
 
// The same works not only with HEREDOC strings,
// but with double-quoted strings as well:
$string = "{$echo(2+2)}";
echo $echo($string);