php-doc-en/reference/spl/splpriorityqueue/compare.xml
2014-09-05 07:44:07 +00:00

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="splpriorityqueue.compare" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>SplPriorityQueue::compare</refname>
<refpurpose>Compare priorities in order to place elements correctly in the heap while sifting up.</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>int</type><methodname>SplPriorityQueue::compare</methodname>
<methodparam><type>mixed</type><parameter>priority1</parameter></methodparam>
<methodparam><type>mixed</type><parameter>priority2</parameter></methodparam>
</methodsynopsis>
<para>
Compare <parameter>priority1</parameter> with <parameter>priority2</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>priority1</parameter></term>
<listitem>
<para>
The priority of the first node being compared.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>priority2</parameter></term>
<listitem>
<para>
The priority of the second node being compared.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Result of the comparison, positive integer if <parameter>priority1</parameter> is greater than <parameter>priority2</parameter>, 0 if they are equal, negative integer otherwise.
</para>
<note>
<para>
Multiple elements with the same priority will get dequeued in no particular order.
</para>
</note>
</refsect1>
</refentry>
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