CVS update: php3/doc/chapters

Date: Friday September 11, 1998 @ 9:34 Author: kk Update of /repository/php3/doc/chapters In directory asf:/u2/tmp/cvs-serv9923/doc/chapters Modified Files: lang-const.sgml Log Message: Many errata from http://ca.php.net/manual/browse-errata.php3 incorporated into the documentation source. (Errata letters A-K). Index: php3/doc/chapters/lang-const.sgml diff -c php3/doc/chapters/lang-const.sgml:1.23 php3/doc/chapters/lang-const.sgml:1.24 *** php3/doc/chapters/lang-const.sgml:1.23 Mon Sep 7 07:58:13 1998 --- php3/doc/chapters/lang-const.sgml Fri Sep 11 09:34:24 1998 *************** *** 476,481 **** --- 476,486 ---- FOR(expr): ... ENDFOR; is NOT supported. </programlisting></informalexample> + <para> + Other languages have a foreach statement to traverse an array + or hash. PHP uses the while statement and the <function>list<function> + and <function>each</function> functions for this. See the documentation + for these functions for an example. <sect1 id="construct.switch"> <title>SWITCH</title> *************** *** 797,803 **** <programlisting role=php> &lt;?php class Cart { ! var items; // Items in our shopping cart // Add $num articles of $artnr to the cart function add_item($artnr, $num) { --- 802,808 ---- <programlisting role=php> &lt;?php class Cart { ! var $items; // Items in our shopping cart // Add $num articles of $artnr to the cart function add_item($artnr, $num) { *************** *** 880,885 **** --- 885,924 ---- object. You have to use $this->something to access any variable or function named something within your current object. </para> + + <para> + Constructors are functions in a class that are automatically + called when you create a new instance of a class. A function + becomes a constructur when it has the same name as the class. + </para> + <informalexample> + class Auto_Cart extends Cart { + function Auto_Cart() { + $this->add_item("10", 1); + } + } + </informalexample> + + <para> + This defines a class Auto_Cart that is a Cart plus a constructor which + initializes the cart with one item of article number "10" each time + a new Auto_Cart is being made with "new". Constructors + can also take arguments and these arguments can be optional, which + makes them much more useful. + </para> + <informalexample> + class Constructor_Cart { + function Constructor_Cart($item = "10", $num = 1) { + $this->add_item($item, $num); + } + } + + // Shop the same old boring stuff. + $default_cart = new Constructor_Cart; + + // Shop for real... + $different_cart = new Constructor_Cart("20", 17); + </informalexample> </sect1> <!-- Keep this comment at the end of the file -- 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