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<!-- $Revision: 1.14 $ -->
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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>
  <title>Description</title>
  <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> and returns &true;
   if it is found in the array, &false; otherwise.
  </para>
  <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>
  <note>
   <para>
    If <parameter>needle</parameter> is a string, the comparison is done in
    a case-sensitive manner.
   </para>
  </note>
  <note>
   <para>
    In PHP versions before 4.2.0 <parameter>needle</parameter> was not
    allowed to be an array.
   </para>
  </note>
  <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>
  <para>
   See also <function>array_search</function>,
   <function>array_key_exists</function>, and
   <function>isset</function>.
  </para>
 </refsect1>
</refentry>

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