What will be the output of , if the page was accessed via "https://example.com/?section=predef_vars&category=_server&page=request_uri#content"?

What is the cause of this warning: 'Warning: Cannot modify header information - headers already sent'?

Preferred way to write this if statement, and why?

What will be the output of <?php echo strrpos('Hello world!', 'o'); ?>?

Which modifier to use in function date() to get difference to Greenwich time (GMT) in hours?

What does the in_array() function in PHP do?

What's the output? $a = 10; echo 'Value of a = $a';

Which is not a valid php.ini parameter with respect to file uploading?

Which is not a valid SimpleXML Parser method?

Which is not a valid PHP parser tag?

Which is the operator with the highest precedence?