reference/array/functions/array-key-exists.xml
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89fe795cc8bcf1b5ff9eb894bff51f006db66a65
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-key-exists">
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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>Checks if the given key or index exists in the array</refpurpose>
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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>mixed</type><parameter>key</parameter></methodparam>
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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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</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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The <parameter>key</parameter> parameter now accepts
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<parameter>bool</parameter>, <parameter>float</parameter>, <parameter>int</parameter>,
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<parameter>null</parameter>, <parameter>resource</parameter>, and
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<parameter>string</parameter> as arguments.
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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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For backward compatibility reasons, <function>array_key_exists</function>
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will also return &true; if <parameter>key</parameter> is a property
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defined within an <type>object</type> given as
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<parameter>array</parameter>. This behaviour should not be relied upon,
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and care should be taken to ensure that <parameter>array</parameter> is
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an <type>array</type>.
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<parameter>array</parameter>. This behaviour is deprecated as of PHP 7.4.0,
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and removed as of PHP 8.0.0.
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</para>
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<para>
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To check whether a property exists in an object, use
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<function>property_exists</function>.
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To check whether a property exists in an object,
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<function>property_exists</function> should be used.
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</para>
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</note>
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</refsect1>
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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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