php man page for runkit_return_value_used

RUNKIT_RETURN_VALUE_USED(3)						 1					       RUNKIT_RETURN_VALUE_USED(3)

runkit_return_value_used - Determines if the current functions return value will be used

SYNOPSIS
       bool runkit_return_value_used (void  )

DESCRIPTION
RETURN VALUES
	Returns TRUE if the function's return value is used by the calling scope, otherwise FALSE

EXAMPLES
       Example #1

	      runkit_return_value_used(3) example

	      <?php
	      function foo() {
		var_dump(runkit_return_value_used());
	      }

	      foo();
	      $f = foo();
	      ?>

	      The above example will output:

	      bool(false)
	      bool(true)

PHP Documentation Group 											       RUNKIT_RETURN_VALUE_USED(3)