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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@283802 c90b9560-bf6c-de11-be94-00142212c4b1
96 lines
No EOL
2.7 KiB
XML
96 lines
No EOL
2.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter xml:id="com.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<section xml:id="com.examples.foreach">
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<title>For Each</title>
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<para>
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Starting with PHP 5, you may use PHP's own
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&foreach; statement to iterate
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over the contents of a standard COM/OLE IEnumVariant. In layman's terms,
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this means that you can use foreach in places where you would have used
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<literal>For Each</literal> in VB/ASP code.
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</para>
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<para>
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<example>
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<title>For Each in ASP</title>
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<programlisting role="asp">
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<![CDATA[
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<%
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Set domainObject = GetObject("WinNT://Domain")
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For Each obj in domainObject
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Response.Write obj.Name & "<br />"
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Next
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%>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>while() ... Next() in PHP 4</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$domainObject = new COM("WinNT://Domain");
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while ($obj = $domainObject->Next()) {
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echo $obj->Name . "<br />";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>foreach in PHP 5</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$domainObject = new COM("WinNT://Domain");
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foreach ($domainObject as $obj) {
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echo $obj->Name . "<br />";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</section>
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<section xml:id="com.examples.arrays">
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<title>Arrays and Array-style COM properties</title>
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<para>
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Many COM objects expose their properties as arrays, or using array-style
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access. In PHP 4, you may use PHP array syntax to read/write such a
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property, but only a single dimension is allowed. If you want to read a
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multi-dimensional property, you could instead make the property access
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into a function call, with each parameter representing each dimension of
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the array access, but there is no way to write to such a property.
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</para>
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<para>
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PHP 5 introduces the following new features to make your life easier:
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<itemizedlist>
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<listitem>
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<para>
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Access multi-dimensional arrays, or COM properties that require
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multiple parameters using PHP array syntax. You can also write or set
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properties using this technique.
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</para>
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</listitem>
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<listitem>
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<para>
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Iterate SafeArrays ("true" arrays) using the &foreach; control structure.
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This works because SafeArrays include information about their size. If an
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array-style property implements IEnumVariant then you can also use
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foreach for that property too; take a look at <xref
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linkend="com.examples.foreach"/> for more information on this topic.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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</section>
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</chapter> |