torben Thu Feb 22 16:43:23 2001 EDT
Modified files:
/phpdoc/en/language oop.xml
Log:
Added an example to help clarify the lack of non-constant variable
initializers in classes in PHP 4 (spurred by Bug #9414).
Index: phpdoc/en/language/oop.xml
diff -u phpdoc/en/language/oop.xml:1.6 phpdoc/en/language/oop.xml:1.7
--- phpdoc/en/language/oop.xml:1.6 Fri Feb 9 11:41:08 2001
+++ phpdoc/en/language/oop.xml Thu Feb 22 16:43:23 2001
@@ -40,10 +40,38 @@
array of articles in the cart and two functions to add and remove
items from this cart.
</para>
- <note><simpara>
- In PHP 4, only constant initializers for <literal>var</literal>
- variables are allowed. Use constructors for non-constant initializers.
- </simpara></note>
+
+ <note>
+ <simpara>
+ In PHP 4, only constant initializers for <literal>var</literal>
+ variables are allowed. Use constructors for non-constant
+ initializers.
+ </simpara>
+ <informalexample>
+ <programlisting role="php">
+/* None of these will work in PHP 4. */
+class Cart {
+ var $todays_date = date("Y-m-d");
+ var $name = $firstname;
+ var $owner = 'Fred ' . 'Jones';
+}
+
+/* This is how it should be done. */
+class Cart {
+ var $todays_date;
+ var $name;
+ var $owner;
+
+ function Cart() {
+ $this->todays_date = date("Y-m-d");
+ $this->name = $GLOBALS['firstname'];
+ /* etc. . . */
+ }
+}
+ </programlisting>
+ </informalexample>
+ </note>
+
<para>
Classes are types, that is, they are blueprints for actual
variables. You have to create a variable of the desired type with
@@ -52,8 +80,8 @@
<informalexample>
<programlisting role="php">
- $cart = new Cart;
- $cart->add_item("10", 1);
+$cart = new Cart;
+$cart->add_item("10", 1);
</programlisting>
</informalexample>
