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https://github.com/sigmasternchen/php-doc-en
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7104ee97ce
Closes GH-250. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@351935 c90b9560-bf6c-de11-be94-00142212c4b1
134 lines
3.3 KiB
XML
134 lines
3.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<sect1 xml:id="control-structures.continue" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>continue</title>
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<?phpdoc print-version-for="continue"?>
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<simpara>
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<literal>continue</literal> is used within looping structures to
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skip the rest of the current loop iteration and continue execution
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at the condition evaluation and then the beginning of the next iteration.
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</simpara>
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<note>
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<simpara>
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In PHP the
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<link linkend="control-structures.switch">switch</link> statement is
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considered a looping structure for the purposes of
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<literal>continue</literal>. <literal>continue</literal> behaves like
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<literal>break</literal> (when no arguments are passed) but will
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raise a warning as this is likely to be a mistake. If a
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<literal>switch</literal> is inside a loop,
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<literal>continue 2</literal> will continue with the next iteration
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of the outer loop.
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</simpara>
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</note>
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<simpara>
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<literal>continue</literal> accepts an optional numeric argument
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which tells it how many levels of enclosing loops it should skip
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to the end of. The default value is <literal>1</literal>, thus skipping
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to the end of the current loop.
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</simpara>
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<para>
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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foreach ($arr as $key => $value) {
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if (!($key % 2)) { // skip even members
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continue;
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}
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do_something_odd($value);
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}
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$i = 0;
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while ($i++ < 5) {
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echo "Outer<br />\n";
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while (1) {
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echo "Middle<br />\n";
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while (1) {
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echo "Inner<br />\n";
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continue 3;
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}
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echo "This never gets output.<br />\n";
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}
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echo "Neither does this.<br />\n";
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}
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?>
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]]>
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</programlisting>
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</informalexample>
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</para>
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<para>
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Omitting the semicolon after <literal>continue</literal> can lead to
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confusion. Here's an example of what you shouldn't do.
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</para>
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<para>
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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for ($i = 0; $i < 5; ++$i) {
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if ($i == 2)
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continue
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print "$i\n";
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}
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?>
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]]>
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</programlisting>
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<para>
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One can expect the result to be:
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</para>
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<screen>
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<![CDATA[
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0
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1
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3
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4
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]]>
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</screen>
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</informalexample>
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</para>
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<para>
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<table>
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<title>Changelog for <literal>continue</literal></title>
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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>7.3.0</entry>
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<entry>
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<literal>continue</literal> within a <literal>switch</literal> that is attempting to act like a <literal>break</literal> statement for the
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<literal>switch</literal> will trigger an <constant>E_WARNING</constant>.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</sect1>
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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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