php-doc-en/reference/pcre/functions/preg-grep.xml
2021-08-17 23:21:45 +02:00

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.preg-grep" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>preg_grep</refname>
<refpurpose>Return array entries that match the pattern</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>array</type><type>false</type></type><methodname>preg_grep</methodname>
<methodparam><type>string</type><parameter>pattern</parameter></methodparam>
<methodparam><type>array</type><parameter>array</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
Returns the array consisting of the elements of the
<parameter>array</parameter> array that match the given
<parameter>pattern</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>pattern</parameter></term>
<listitem>
<para>
The pattern to search for, as a string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
The input array.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>flags</parameter></term>
<listitem>
<para>
If set to <constant>PREG_GREP_INVERT</constant>, this function returns
the elements of the input array that do <emphasis>not</emphasis> match
the given <parameter>pattern</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an array indexed using the keys from the
<parameter>array</parameter> array, &return.falseforfailure;.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>preg_grep</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// return all array elements
// containing floating point numbers
$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><link linkend="pcre.pattern">PCRE Patterns</link></member>
<member><function>preg_quote</function></member>
<member><function>preg_match_all</function></member>
<member><function>preg_filter</function></member>
<member><function>preg_last_error</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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