Strict warning: Only variables should be passed by reference in include() (line 26 of page.tpl.php).

it was perfectly worked on php 5.3.10, but after upgrade php version it will not working. <br> <br>The reason you are seeing this message after upgrading, is that strict warnings (E_STRICT) became part of E_ALL in 5.4.0. The default value for error_reporting in 5.5.7 excludes E_STRICT, however if you didn’t alter your php.ini file, you will still have the 5.3 default which doesn’t exclude E_STRICT: <br> <br> 5.3: # Default Value: E_ALL & ~E_NOTICE <br> <br> 5.5: # Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED <br> <br>The correct action to resolve this is to add & ~E_STRICT to your existing error_reporting value in php.ini. <br> <br>http://php.net/manual/en/function.error-reporting.php#refsect1-function.error-reporting-changelog

the problem you are having is that you are passing the return of the function call “_block_get_renderable_array” to drupal_render. drupal_render expects that parameter to be passed by reference. You can only pass a variable by reference NOT the return value of a function call.

Here is an example fix. <pre> $block = block_load(‘block’, ‘7’); $render_block = _block_get_renderable_array(_block_render_blocks(array($block))) $output = drupal_render($render_block); print $output; </pre>

For more information on resolving this issue with your code, please refer to: http://www.php.net/manual/en/language.references.pass.php <br> <br>[Not recommended] <br>However, to prevent this warnings from displaying, add “~E_STRICT” to your php.ini on the error_reporting line. Such as: <br>error_reporting = E_ALL ~E_STRICT