cvs: /phpdoc/language operators.sgml

cslawi Mon Nov 15 04:32:19 1999 EDT Modified files: /phpdoc/language operators.sgml Log: Added note about passing by value and reference in PHP3 and 4. Index: phpdoc/language/operators.sgml diff -u phpdoc/language/operators.sgml:1.3 phpdoc/language/operators.sgml:1.4 --- phpdoc/language/operators.sgml:1.3 Wed Oct 20 18:52:31 1999 +++ phpdoc/language/operators.sgml Mon Nov 15 04:32:18 1999 @@ -97,7 +97,20 @@ $b = "Hello "; $b .= "There!"; // sets $b to "Hello There!", just like $b = $b . "There!"; </programlisting></informalexample> - </para></sect1> + </para> + + <para> + Note that the assignment copies the original variable to the new + one (assignment by value), so changes to one will not affect the + other. This may also have relevance if you need to copy something + like a large array inside a tight loop. PHP4 supports assignment + by reference, using the <computeroutput>$var = + &amp;$othervar;</computeroutput> syntax, but this is not possible + in PHP3. 'Assignment by reference' means that both variables end + up pointing at the same data, and nothing is copied anywhere. + </para> + +</sect1> <sect1 id="language.operators.bitwise"> <title>Bitwise Operators</title>