#18645 [Com]: dot-operator allows bogus operations with shortcut for if

ID: 18645 Comment by: m.ford@lmu.ac.uk Reported By: alpha@rrs.at Status: Open Bug Type: Scripting Engine problem Operating System: windows 2000 PHP Version: 4.2.1 New Comment: Let's see, from http://www.php.net/manual/en/language.operators.php, . has higher precedence than ?:, so this: > echo "string1 ".empty($var)?0:$var." string2"; resolves to: echo ("string1 ".empty($var))?0:($var." string2"); which seems like it'll echo "0" to me... The answer, as you rightly show, is to use parentheses to override the precedence. On your other error messages: > echo 'string1 '.empty($var)?0.' string2'; is just plain wrong since the operator is ?: and must have all parts present; but I guess it also fails because the parser is reading "0." as a floating number and objecting to the immediately following string quote. This would also apply to: > echo 'string1 '.0.' string2'; Again, the solution would be to wite it in a way that is not ambiguous, e.g.: echo 'string1 ' . 0 . ' string2'; Cheers! Mike Previous Comments: ------------------------------------------------------------------------ [2002-07-30 09:01:44] alpha@rrs.at given this code <?php $var = 5; echo "string1 ".empty($var)?0:$var." string2"; // output "0" - WRONG echo "<br>"; echo "string1 ".(empty($var)?0:$var)." string2<br>"; // output "string1 5 string2" echo "<br>"; echo 'string1 '.empty($var)?0:$var.' string2'; // output "0" - WRONG echo '<br>'; echo 'string1 '.(empty($var)?0:$var).' string2<br>'; // output "string1 5 string2" echo '<br>'; ?> I get an error-message if I try echo 'string1 '.empty($var)?0.' string2'; or just echo 'string1 '.0.' string2'; , thus there is a missing error check at parse time. I don't know enough about the internal functions of PHP to say if it's the scripting engine or something else. See yourself ... ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=18645&edit=1