📄 php_looping.asp
字号:
echo "The number is " . $i . "<br />";
}
while ($i<5);
?></pre>
<pre></body>
</html></pre>
</td>
</tr>
</table>
<br />
<hr />
<h2>The for Statement</h2>
<p>The for statement is used when you know how many times you want to execute a
statement or a list of statements.</p>
<h3>Syntax</h3>
<table class="ex" cellspacing="0" width="100%" border="1">
<tr>
<td>
<pre>for (<i>initialization</i>; <i>condition</i>; <i>increment</i>)
{
<i>code to be executed;</i>
}</pre>
</td>
</tr>
</table>
<p><b>Note:</b> The for statement has three parameters. The first parameter
initializes variables,
the second parameter holds the condition, and the third parameter contains the increments
required to implement the loop. If more than one variable is included in
the initialization or the increment parameter, they should be
separated by commas. The condition must evaluate to true or false.</p>
<h3>Example</h3>
<p>The
following example prints the text "Hello World!" five times:</p>
<table class="ex" cellspacing="0" width="100%" border="1">
<tr>
<td>
<pre><html>
<body></pre>
<pre><?php
for ($i=1; $i<=5; $i++)
{
echo "Hello World!<br />";
}
?></pre>
<pre></body>
</html></pre>
</td>
</tr>
</table>
<br />
<hr />
<h2>The foreach Statement</h2>
<p>The foreach statement is used to loop through arrays.</p>
<p>For every loop, the value of the
current array element is assigned to $value (and the array pointer is moved by one) -
so on the next loop, you'll be looking at the next element.</p>
<h3>Syntax</h3>
<table class="ex" cellspacing="0" width="100%" border="1">
<tr>
<td>
<pre>foreach (<i>array </i>as<i> value</i>)
{
<i>code to be executed;</i>
}</pre>
</td>
</tr>
</table>
<h3>Example</h3>
<p>The following example demonstrates a loop that will print the values of
the given array:</p>
<table class="ex" cellspacing="0" width="100%" border="1">
<tr>
<td>
<pre><html>
<body></pre>
<pre><?php
$arr=array("one", "two", "three");</pre>
<pre>foreach ($arr as $value)
{
echo "Value: " . $value . "<br />";
}
?></pre>
<pre></body>
</html></pre>
</td>
</tr>
</table>
<br />
<hr />
<a href="php_arrays.asp"><img alt="previous" border="0" src="../images/btn_previous.gif" width="100" height="20" /></a>
<a href="php_functions.asp"><img alt="next" border="0" src="../images/btn_next.gif" width="100" height="20" /></a>
<br />
<hr />
<!-- **** SPOTLIGHTS 1 **** -->
<iframe src="../banners/aspallframe.asp" height="110" width="485"
marginwidth="0" marginheight="0" frameborder="0" scrolling="no">
Your browser does not support inline frames or is currently configured not to display inline frames.
</iframe>
<hr />
<!-- **** SPOTLIGHTS 2 **** -->
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td rowspan="3" align="left" valign="top">
<img src="../images/stylusstudio_01.gif" width="118" height="470" alt="" align="top" /></td>
<td colspan="2" align="left" valign="top">
<img src="../images/stylusstudio_02.gif" width="376" height="154" alt="" /></td>
<td rowspan="3" align="left" valign="top">
<img src="../images/stylusstudio_03.gif" width="6" height="470" alt="" /></td>
</tr>
<tr>
<td colspan="2" bgcolor="#e9eaec">
<table width="376" border="0" cellspacing="5" cellpadding="0">
<tr align="left" valign="top">
<td><strong>Learn XML with Stylus Studio XML Editor – Free Download<br /></strong><br />
Stylus Studio provides tools for editing and debugging
<a style="color:#1675b2" href="../../www.stylusstudio.com/xml/editor/default.htm" target="_blank">XML</a>,
<a style="color:#1675b2" href="../../www.stylusstudio.com/xslt.html" target="_blank">XSLT</a>,
<a style="color:#1675b2" href="../../www.stylusstudio.com/xml_schema.html" target="_blank">XML Schema</a>,
<a style="color:#1675b2" href="../../www.stylusstudio.com/dtd.html" target="_blank">DTD</a>,
<a style="color:#1675b2" href="../../www.stylusstudio.com/xquery.html" target="_blank">XQuery</a>,
<a style="color:#1675b2" href="../../www.stylusstudio.com/web_services.html" target="_blank">Web Services</a>,and more!<br /><br />
<strong>Using Stylus Studio XML Tools You Can:<br /></strong>
<ul>
<li type="disc" style="margin-bottom:5px">
<a style="color:#1675b2" href="../../www.stylusstudio.com/convert_to_xml.html" target="_blank">
Convert any File to XML</a> (CSV, Tab-separated, HTML, EDI & more.)</li>
<li type="disc" style="margin-bottom:5px">
<a style="color:#1675b2" href="../../www.stylusstudio.com/videos/ddxqdemo/datadirectxquery.html" target="_blank">
Access and Update any database as XML</a> (SQL Server, Oracle, MySQL & more.)</li>
<li type="disc" style="margin-bottom:5px">
View, Edit, Parse, and Validate XML files.</li>
<li type="disc">
<a style="color:#1675b2" href="../../www.stylusstudio.com/xml/publishing.html" target="_blank">
Publish your data</a>, including <a style="color:#1675b2" href="../../www.stylusstudio.com/videos/publisher1/publisher1.html" target="_blank">XML to HTML</a>
or <a style="color:#1675b2" href="../../www.stylusstudio.com/xml_to_pdf.html" target="_blank">XML to PDF</a></li>
</ul>
<p>See why millions use Stylus Studio as their preferred XML tool. Download a
<a style="color:#1675b2" href="../../www.stylusstudio.com/xml_download.html" target="_blank">FREE TRIAL</a>
or watch an online <a style="color:#1675b2" href="../../www.stylusstudio.com/xml_videos.html" target="_blank">VIDEO DEMO</a> today!</p>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="left" valign="top">
<a href="../../www.stylusstudio.com/xml_download.html" target="_blank">
<img name="stylusstudio_05" src="../images/stylusstudio_05.gif" width="159" height="35" align="top" border="0" alt=""
onmouseover="this.src='../images/stylusstudio_05-over.gif'" onmouseout="this.src='../images/stylusstudio_05.gif'" />
</a></td>
<td align="left" valign="top">
<a href="../../www.stylusstudio.com/xml_videos.html" target="_blank">
<img name="stylusstudio_06" src="../images/stylusstudio_06.gif" width="217" height="35" align="top" border="0" alt=""
onmouseover="this.src='../images/stylusstudio_06-over.gif'" onmouseout="this.src='../images/stylusstudio_06.gif'" /></a></td>
</tr>
</table>
<hr />
<!-- **** SPOTLIGHTS 3 **** -->
<table cellpadding="0" cellspacing="0"><tr><td width="72"></td><td>
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*txt*/
google_ad_slot = "1699448869";
google_ad_width = 336;
google_ad_height = 280;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td></tr></table>
<hr />
<center>
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*imgtxt*/
google_ad_slot = "8606855891";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</center>
<hr />
<!-- **** END SPOTLIGHTS **** -->
</td></tr>
<tr><td>
<p>Jump to: <a href="#top" target="_top"><b>Top of Page</b></a>
or <a href="../default.asp" target="_top"><b>HOME</b></a> or
<a href='php_looping.asp@output=print' target="_blank">
<img src="../images/print.gif" alt="Printer Friendly" border="0" />
<b>Printer friendly page</b></a></p>
<p>W3Schools provides material for training only. We do not warrant the correctness of its contents.
The risk from using it lies entirely with the user.
While using this site, you agree to have read and accepted our
<a href="../about/about_copyright.asp">terms of use</a> and
<a href="../about/about_privacy.asp">privacy policy</a>.
</p>
<p><a href="../about/about_copyright.asp">Copyright 1999-2008</a> by Refsnes Data. All Rights Reserved.</p>
<table border="0" width="100%" cellspacing="0" cellpadding="0"><tr>
<td width="60%" align="left">
<a href="../../validator.w3.org/check@uri=referer" target="_blank">
<img src="../images/vxhtml.gif" alt="Validate" width="88" height="31" border="0" /></a>
<a href="../../jigsaw.w3.org/css-validator/check@uri=referer" target="_blank">
<img src="../images/vcss.gif" alt="Validate" width="88" height="31" border="0" /></a>
<a href="../../www.w3.org/WAI/WCAG1A-Conformance" title="Explanation of Level A Conformance" target="_blank">
<img src="../images/wai.gif" alt="W3C-WAI level A conformance icon" width="88" height="31" border="0" /></a>
</td>
<td>
<a href="../xhtml/xhtml_howto.asp" target="_top">W3Schools was converted to XHTML in December 1999</a>
</td></tr>
</table>
</td></tr>
</table>
</td>
<td width="145" align="center" valign="top">
<iframe style="background-color:#f1f1f1" src="../banners/rightcolumn.asp@secid=php" height="1500" width="147"
marginwidth="0" marginheight="0" frameborder="0" scrolling="no">
</iframe>
</td>
</tr></table>
</body>
</html>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -