#28845 [Opn]: warning on two TRUE expressions while calling include*() in a if-statement

ID: 28845 User updated by: david dot rech at virusmedia dot de Reported By: david dot rech at virusmedia dot de Status: Open Bug Type: *Directory/Filesystem functions Operating System: Windows XP SP1 PHP Version: 4CVS-2004-06-19 (stable) New Comment: Sorry, missed the closing brace in second if-statement... Must be: "Whereas that code, with the first expression in braces, prints "1" again. if( (include_once(__FILE__)) && is_integer(1) ) echo 1;" Previous Comments: ------------------------------------------------------------------------ [2004-06-19 20:02:25] david dot rech at virusmedia dot de Description: ------------ I've notice some strange behaviour with include() and include_once() calls in an if-statement whereas two expressions are TRUE and logically combined with the '&&' operator. While if( true && true ) echo 1; would print out "1" as expected, this code however does not: if( include_once(__FILE__) && is_integer(1) ) echo 1; Whereas that code, with the first expression in braces, prints "1" again. if( (include_once(__FILE__) && is_integer(1) ) echo 1; In the example you should notice that the expression is still TRUE with other functions - even without braces around first expression. Also, somehow the result of the second expression gets copied to the first argument of the first expression as an integer. Look at this warning: Warning: main(1): failed to open stream: No such file or directory in [...] on line 12 That's what happens if second expression is true and include_once() was'nt put into braces. Try to negate the second expression - you will get a '0' referred as the argument of include_once() in the warning. So is this some strange magic, or did I've miss the point completely? Reproduce code: --------------- <?php // Expected behaviour if( true && true ) { // As expected - the expression is TRUE echo "1st: That may have worked\n"; } // Weird behaviour if( class_exists('stdClass') && is_integer(1) ) { // Again - the expression is TRUE echo "2nd: You don't see that, don't you?\n"; } if( @include_once(__FILE__) && is_integer(1) ) { // Expression seems to be FALSE and causes a weird warning without the @ echo "3rd: So you see this..?"; } if( (include_once(__FILE__)) && is_integer(1) ) { // TRUE echo "4rd: In fact, you see this..."; } ?> Expected result: ---------------- 1st: That may have worked 2nd: You don't see that, don't you? 3rd: So you see this..? 4rd: In fact, you see this... Actual result: -------------- 1st: That may have worked 2nd: You don't see that, don't you? 4rd: In fact, you see this... ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=28845&edit=1