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e93feee287
* Integrate SPL language-snippets They are only used once, having them as entities is useless. * Move SPL interfaces from misc to interface page * Rearrange SPL docs Move ArrayObject to data structures, get rid of misc page, do not chunk introduction * Remove interface list, the ToC shows the same info
133 lines
3.5 KiB
XML
133 lines
3.5 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<part xml:id="spl.datastructures" xmlns="http://docbook.org/ns/docbook">
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<title>Datastructures</title>
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<partintro>
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<para>
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SPL provides a set of standard datastructures. They are grouped here by their
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underlying implementation which usually defines their general field of
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application.
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</para>
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<section>
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<title>Doubly Linked Lists</title>
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<para>
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A Doubly Linked List (DLL) is a list of nodes linked in both directions to
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each other. Iterator's operations, access to both ends, addition or
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removal of nodes have a cost of O(1) when the underlying structure is a DLL.
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It hence provides a decent implementation for stacks and queues.
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</para>
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<itemizedlist>
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<listitem>
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<simpara><classname>SplDoublyLinkedList</classname></simpara>
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<itemizedlist>
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<listitem><simpara><classname>SplStack</classname></simpara></listitem>
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<listitem><simpara><classname>SplQueue</classname></simpara></listitem>
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</itemizedlist>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Heaps</title>
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<para>
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Heaps are tree-like structures that follow the heap-property: each node
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is greater than or equal to its children, when compared using the
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implemented compare method which is global to the heap.
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</para>
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<itemizedlist>
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<listitem>
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<simpara><classname>SplHeap</classname></simpara>
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<itemizedlist>
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<listitem><simpara><classname>SplMaxHeap</classname></simpara></listitem>
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<listitem><simpara><classname>SplMinHeap</classname></simpara></listitem>
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</itemizedlist>
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</listitem>
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<listitem>
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<simpara><classname>SplPriorityQueue</classname></simpara>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Arrays</title>
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<para>
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Arrays are structures that store the data in a contiguous way,
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accessible via indexes.
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</para>
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<note>
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<simpara>
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Do not confuse this with PHP's native <type>array</type> type.
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PHP arrays are in reality ordered hashtables.
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However, SPL provides the <classname>ArrayObject</classname> class
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to wrap PHP arrays into an object.
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</simpara>
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</note>
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<itemizedlist>
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<listitem>
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<simpara><classname>SplFixedArray</classname></simpara>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Map</title>
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<para>
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A map is a datastructure holding key-value pairs. PHP arrays can be seen as maps from integers/strings to values. SPL provides a map from objects to data. This map can also be used as an object set.
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</para>
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<itemizedlist>
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<listitem>
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<simpara><classname>SplObjectStorage</classname></simpara>
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</listitem>
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</itemizedlist>
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</section>
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</partintro>
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&reference.spl.spldoublylinkedlist;
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&reference.spl.splstack;
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&reference.spl.splqueue;
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&reference.spl.splheap;
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&reference.spl.splmaxheap;
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&reference.spl.splminheap;
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&reference.spl.splpriorityqueue;
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&reference.spl.splfixedarray;
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&reference.spl.arrayobject;
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&reference.spl.splobjectstorage;
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</part>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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