php-doc-en/reference/array/functions/in-array.xml

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<refentry xml:id="function.in-array" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>in_array</refname>
  <refpurpose>Checks if a value exists in an array</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>in_array</methodname>
   <methodparam><type>mixed</type><parameter>needle</parameter></methodparam>
   <methodparam><type>array</type><parameter>haystack</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>strict</parameter></methodparam>
  </methodsynopsis>
  <para>
   Searches <parameter>haystack</parameter> for <parameter>needle</parameter>.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>needle</parameter></term>
     <listitem>
      <para>
       The searched value.
      </para>
      <note>
       <para>
        If <parameter>needle</parameter> is a string, the comparison is done
        in a case-sensitive manner.
       </para>
      </note>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>haystack</parameter></term>
     <listitem>
      <para>
       The array.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>strict</parameter></term>
     <listitem>
      <para>
       If the third parameter <parameter>strict</parameter> is set to &true;
       then the <function>in_array</function> function will also check the
       <link linkend="language.types">types</link> of the
       <parameter>needle</parameter> in the <parameter>haystack</parameter>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if <parameter>needle</parameter> is found in the array,
   &false; otherwise.
  </para>
 </refsect1>
 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>4.2.0</entry>
       <entry>
        <parameter>needle</parameter> may now be an array.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>in_array</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
    echo "Got Irix";
}
if (in_array("mac", $os)) {
    echo "Got mac";
}
?>
]]>
    </programlisting>
    <para>
     The second condition fails because <function>in_array</function>
     is case-sensitive, so the program above will display:
    </para>
    <screen>
<![CDATA[
Got Irix
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>in_array</function> with strict example</title>
    <programlisting role="php">
<![CDATA[
<?php
$a = array('1.10', 12.4, 1.13);

if (in_array('12.4', $a, true)) {
    echo "'12.4' found with strict check\n";
}

if (in_array(1.13, $a, true)) {
    echo "1.13 found with strict check\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1.13 found with strict check
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>in_array</function> with an array as needle</title>
    <programlisting role="php">
<![CDATA[
<?php
$a = array(array('p', 'h'), array('p', 'r'), 'o');

if (in_array(array('p', 'h'), $a)) {
    echo "'ph' was found\n";
}

if (in_array(array('f', 'i'), $a)) {
    echo "'fi' was found\n";
}

if (in_array('o', $a)) {
    echo "'o' was found\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
  'ph' was found
  'o' was found
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_search</function></member>
    <member><function>isset</function></member>
    <member><function>array_key_exists</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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