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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 293846 $ -->
<sect1 xml:id="control-structures.continue" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title><literal>continue</literal></title>
<simpara>
<literal>continue</literal> is used within looping structures to
skip the rest of the current loop iteration and continue execution
at the condition evaluation and then the beginning of the next iteration.
</simpara>
<note>
<simpara>
Note that in PHP the
<link linkend="control-structures.switch">switch</link> statement is
considered a looping structure for the purposes of
<literal>continue</literal>.
</simpara>
</note>
<simpara>
<literal>continue</literal> accepts an optional numeric argument
which tells it how many levels of enclosing loops it should skip
to the end of.
</simpara>
<note>
<para>
<literal>continue 0;</literal> and <literal>continue 1;</literal> is the same
as running <literal>continue;</literal>.
</para>
</note>
<para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
while (list($key, $value) = each($arr)) {
if (!($key % 2)) { // skip odd members
continue;
}
do_something_odd($value);
}
$i = 0;
while ($i++ < 5) {
echo "Outer<br />\n";
while (1) {
echo " Middle<br />\n";
while (1) {
echo " Inner<br />\n";
continue 3;
}
echo "This never gets output.<br />\n";
}
echo "Neither does this.<br />\n";
}
?>
]]>
</programlisting>
</informalexample>
</para>
<para>
Omitting the semicolon after <literal>continue</literal> can lead to
confusion. Here's an example of what you shouldn't do.
</para>
<para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
for ($i = 0; $i < 5; ++$i) {
if ($i == 2)
continue
print "$i\n";
}
?>
]]>
</programlisting>
<para>
One can expect the result to be :
</para>
<screen>
<![CDATA[
0
1
3
4
]]>
</screen>
<para>
but this script will output :
</para>
<screen>
<![CDATA[
2
]]>
</screen>
<para>
because the return value of the <function>print</function>
call is <literal>int(1)</literal>, and it will look like the
optional numeric argument mentioned above.
</para>
</informalexample>
</para>
</sect1>
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