php-doc-en/reference/spl/splpriorityqueue/compare.xml

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<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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