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180 lines
4.6 KiB
XML
180 lines
4.6 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- EN-Revision: 73048c75fbe328342b74f0ffb0a0c85c477f5cde Maintainer: leszek Status: ready -->
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<!-- $Revision$ -->
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<!-- CREDITS: sobak, grzesiek -->
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<refentry xml:id="function.array-key-exists" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>array_key_exists</refname>
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<refpurpose>Sprawdza czy podany klucz lub indeks istnieje w tablicy</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>array_key_exists</methodname>
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<methodparam><type class="union"><type>string</type><type>int</type><type>float</type><type>bool</type><type>resource</type><type>null</type></type><parameter>key</parameter></methodparam>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_key_exists</function> zwraca &true; jeśli
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podany klucz <parameter>key</parameter> jest ustawiony w tablicy.
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Parametr <parameter>key</parameter> może być dowolną wartością możliwą
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dla indeksu tablicy.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>key</parameter></term>
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<listitem>
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<para>
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Wartość do sprawdzenia.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>array</parameter></term>
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<listitem>
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<para>
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Tablica z kluczami do sprawdzenia.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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<note>
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<para>
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<function>array_key_exists</function> szuka kluczy tylko w pierwszym wymiarze tablicy.
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Klucze zagnieżdżone w tablicach wielowymiarowych nie zostaną znalezione.
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</para>
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</note>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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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>8.0.0</entry>
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<entry>
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Parametr <parameter>key</parameter> akceptuje teraz
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<type>bool</type>, <type>float</type>, <type>int</type>,
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<type>null</type>, <type>resource</type>, i
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<type>string</type> jako argumenty.
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</entry>
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</row>
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<row>
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<entry>8.0.0</entry>
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<entry>
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Przekazywanie obiektu jako parametr <parameter>array</parameter> nie jest już obsługiwane.
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</entry>
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</row>
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<row>
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<entry>7.4.0</entry>
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<entry>
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Przekazywanie obiektu jako parametr <parameter>array</parameter> jest uznane za przestarzałe. Zamiast tego skorzystaj z funkcji <function>property_exists</function>.
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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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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Przykład użycia <function>array_key_exists</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$searchArray = ['pierwszy' => 1, 'drugi' => 4];
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var_dump(array_key_exists('pierwszy', $searchArray));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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bool(true)
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]]>
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</screen>
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</example>
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</para>
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<example>
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<title><function>array_key_exists</function> vs <function>isset</function></title>
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<para>
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Funkcja <function>isset</function> nie zwraca &true; dla kluczy
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przypisanych do wartości &null;, podczas gdy
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<function>array_key_exists</function> tak.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$tablica = ['pierwszy' => 1, 'drugi' => 4];
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var_dump(isset($searchArray['pierwszy']));
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var_dump(array_key_exists('pierwszy', $searchArray));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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bool(false)
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bool(true)
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]]>
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</screen>
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</example>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>isset</function></member>
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<member><function>array_keys</function></member>
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<member><function>in_array</function></member>
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<member><function>property_exists</function></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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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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