CVS update: php3/doc/chapters

Date: Monday May 24, 1999 @ 21:32 Author: jim Update of /repository/php3/doc/chapters In directory php:/tmp/cvs-serv31851 Modified Files: lang-const.sgml Log Message: Add operator precedence table. Index: php3/doc/chapters/lang-const.sgml diff -u php3/doc/chapters/lang-const.sgml:1.39 php3/doc/chapters/lang-const.sgml:1.40 --- php3/doc/chapters/lang-const.sgml:1.39 Mon May 24 21:13:05 1999 +++ php3/doc/chapters/lang-const.sgml Mon May 24 21:32:32 1999 @@ -1592,8 +1592,110 @@ <symbol>expr1</symbol> evaluates to false. <sect2 id="precedence"> - <title>Precedence</title> - <simpara></simpara> + <title>Operator Precedence</title> + <para> + The precedence of an operator specifies how "tightly" it binds + two expressions together. For example, in the expression + <literal>1 + 5 * 3</literal>, the answer is 16 and not + 18 because the multiplication ("*") operator has a higher precedence + than the addition ("+") operator. + <para> + The following table lists the precedence of operators with the + lowest-precedence operators listed first. + + <table> + <title>Operator Precedence</title> + <tgroup cols="2"> + <thead> + <row> + <entry>Associativity</entry> + <entry>Operators</entry> + </row> + </thead> + <tbody> + <row> + <entry>left</entry> + <entry>,</entry> + </row> + <row> + <entry>left</entry> + <entry>or</entry> + </row> + <row> + <entry>left</entry> + <entry>xor</entry> + </row> + <row> + <entry>left</entry> + <entry>and</entry> + </row> + <row> + <entry>right</entry> + <entry>print</entry> + </row> + <row> + <entry>left</entry> + <entry>= += -= *= /= .= %= &= != ~= &lt;&lt;= &gt;&gt;=</entry> + </row> + <row> + <entry>left</entry> + <entry>? :</entry> + </row> + <row> + <entry>left</entry> + <entry>||</entry> + </row> + <row> + <entry>left</entry> + <entry>&amp;&amp;</entry> + </row> + <row> + <entry>left</entry> + <entry>|</entry> + </row> + <row> + <entry>left</entry> + <entry>^</entry> + </row> + <row> + <entry>left</entry> + <entry>&amp;</entry> + </row> + <row> + <entry>non-associative</entry> + <entry>== !=</entry> + </row> + <row> + <entry>non-associative</entry> + <entry>&lt; &lt;= &gt; &gt;=</entry> + </row> + <row> + <entry>left</entry> + <entry>&lt;&lt; &gt;&gt;</entry> + </row> + <row> + <entry>left</entry> + <entry>+ - .</entry> + </row> + <row> + <entry>left</entry> + <entry>* / %</entry> + </row> + <row> + <entry>right</entry> + <entry>! ~ ++ -- (int) (double) (string) (array) (object) @</entry> + </row> + <row> + <entry>right</entry> + <entry>[</entry> + </row> + <row> + <entry>non-associative</entry> + <entry>new</entry> + </row> + </tbody> + </tgroup> + </table> <!-- Keep this comment at the end of the file Local variables: -- PHP Development Mailing List http://www.php.net/ To unsubscribe send an empty message to php-dev-unsubscribe@lists.php.net For help: php-dev-help@lists.php.net