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continue.xml
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164 lines (163 loc) · 3.51 KB
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 16389a7b31069481d6c8c0705172bee5ef1ddf5f Maintainer: dallas Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<sect1 xml:id="control-structures.continue" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>continue</title>
<?phpdoc print-version-for="continue"?>
<simpara>
<literal>continue</literal>
在循环结构用用来跳过本次循环中剩余的代码并在条件求值为真时开始执行下一次循环。
</simpara>
<note>
<simpara>
在 PHP 中
<link linkend="control-structures.switch">switch</link>
语句被认为是可以使用 <literal>continue</literal> 的一种循环结构。
<literal>continue</literal> 的行为类似于没有传递参数的
<literal>break</literal> ，但会引发警告，因为这可能是一个错误。
如果 <literal>switch</literal> 在循环内，
<literal>continue 2</literal> 将会外部循环中的下一个迭代中继续。
</simpara>
</note>
<simpara>
<literal>continue</literal> 接受一个可选的数字参数来决定跳过几重循环到循环结尾。默认值是
<literal>1</literal>，即跳到当前循环末尾。
</simpara>
<para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
$arr = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
foreach ($arr as $key => $value) {
if (0 === ($key % 2)) { // 跳过偶数键的成员
continue;
}
echo $value . "\n";
}
?>
]]>
</programlisting>
&examples.outputs;
<screen>
<![CDATA[
one
three
five
]]>
</screen>
<programlisting role="php">
<![CDATA[
<?php
$i = 0;
while ($i++ < 5) {
echo "Outer\n";
while (1) {
echo "Middle\n";
while (1) {
echo "Inner\n";
continue 3;
}
echo "This never gets output.\n";
}
echo "Neither does this.\n";
}
?>
]]>
</programlisting>
&examples.outputs;
<screen>
<![CDATA[
Outer
Middle
Inner
Outer
Middle
Inner
Outer
Middle
Inner
Outer
Middle
Inner
Outer
Middle
Inner
]]>
</screen>
</informalexample>
</para>
<para>
省略 <literal>continue</literal>
后面的分号会导致混淆。以下例子示意了不应该这样做。
</para>
<para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
for ($i = 0; $i < 5; ++$i) {
if ($i == 2)
continue
print "$i\n";
}
?>
]]>
</programlisting>
<para>
希望得到的结果是：
</para>
<screen>
<![CDATA[
0
1
3
4
]]>
</screen>
</informalexample>
</para>
<para>
<table>
<title><literal>continue</literal> 的更新记录</title>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.3.0</entry>
<entry>
在 <literal>switch</literal> 中 <literal>continue</literal> 语句试图代替 <literal>break</literal>
语句将会触发 <constant>E_WARNING</constant> 。
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</sect1>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->