Re: Operator precedence is undefined?
| From: | Yasuo Ohgaki | Date: | Sat, 20 Jul 2013 03:27:41 +0000 |
| Subject: | Re: Operator precedence is undefined? | ||
| References: | 1 2 3 4 5 6 7 8 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-68240@lists.php.net to get a copy of this message | ||
Hi Sherif,
I changed the example as follows.
Thank you for your comment.
[yohgaki@dev en]$ svn diff
Index: language/operators.xml
===================================================================
--- language/operators.xml (リビジョン 330982)
+++ language/operators.xml (作業コピー)
@@ -225,15 +225,16 @@
<![CDATA[
<?php
$a = 3 * 3 % 5; // (3 * 3) % 5 = 4
+// ternary operator associativity differs from C/C++
$a = true ? 0 : true ? 1 : 2; // (true ? 0 : true) ? 1 : 2 = 2
$a = 1;
$b = 2;
$a = $b += 3; // $a = ($b += 3) -> $a = 5, $b = 5
-// mixing ++ and + produces undefined behavior
+// mixing ++ and +
$a = 1;
-echo ++$a + $a++; // may print 4 or 5
+echo ++$a + $a++; // same as ++$a; echo $a + $a; $a++;
?>
]]>
</programlisting>