reference/array/functions/key.xml
0a192fcd9cc43c0007de795063b4494974058992
0a192fcd9cc43c0007de795063b4494974058992
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>mixed</type><methodname>key</methodname>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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<type class="union"><type>int</type><type>string</type><type>null</type></type><methodname>key</methodname>
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<methodparam><type class="union"><type>array</type><type>object</type></type><parameter>array</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>key</function> returns the index element of the current array
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empty, <function>key</function> returns &null;.
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>7.0.0</entry>
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<entry>
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<parameter>array</parameter> is now always passed by value.
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Prior to this version, it was passed by reference if possible,
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and by value otherwise.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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&standard.changelog.calling-on-objects;
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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// key where value equals "apple"
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while ($fruit_name = current($array)) {
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if ($fruit_name == 'apple') {
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echo key($array).'<br />';
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echo key($array), "\n";
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}
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next($array);
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}
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&example.outputs;
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<screen>
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<![CDATA[
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fruit1<br />
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fruit4<br />
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fruit5<br />
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fruit1
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fruit4
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fruit5
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]]>
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</screen>
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</example>
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<simplelist>
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<member><function>current</function></member>
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<member><function>next</function></member>
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<member><function>array_key_first</function></member>
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<member><link linkend="control-structures.foreach">foreach</link></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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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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