📄 php_syntax.asp
字号:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>PHP Syntax</title>
<link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<meta name="Keywords" content="xml,tutorial,html,dhtml,css,xsl,xhtml,javascript,asp,ado,vbscript,dom,sql,colors,soap,php,authoring,programming,training,learning,beginner's guide,primer,lessons,school,howto,reference,examples,samples,source code,tags,demos,tips,links,FAQ,tag list,forms,frames,color table,w3c,cascading style sheets,active server pages,dynamic html,internet,database,development,Web building,Webmaster,html guide" />
<meta name="Description" content="Free HTML XHTML CSS JavaScript DHTML XML DOM XSL XSLT RSS AJAX ASP ADO PHP SQL tutorials, references, examples for web building." />
<meta http-equiv="pragma" content="no-cache" />
<meta http-equiv="cache-control" content="no-cache" />
<link rel="stylesheet" type="text/css" href="../stdtheme.css" />
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "../../https@ssl./default.htm" : "../../www./default.htm");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-3855518-1");
pageTracker._initData();
pageTracker._trackPageview();
</script>
</head>
<body>
<a name="top"></a>
<table cellpadding="0" cellspacing="0" width="100%" bgcolor="#808080">
<tr>
<td width="234" valign="top">
<a href="../default.htm"><img src="../images/w3default80.jpg" border="0" alt="W3Schools" /></a>
</td>
<th valign="middle" align="left" class="right">
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*txtimg*/
google_ad_slot = "5330033957";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript" src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
<noscript>
<a href="../default.asp" target="_blank"><img src="../banners/w6.gif" border="0" alt="W3Schools" /></a>
</noscript>
<br /></th>
</tr>
</table>
<table style="margin-left:1px" width="800px" border="0" cellpadding="0" cellspacing="2">
<tr>
<td width="137" class="content" valign="top"><br />
<a class="left" href="../default.asp" target="_top">
<img src="../images/homeicon.gif" border="0" alt="home" /></a>
<a class="left" href="../default.asp" target="_top">
<b>HOME</b></a>
<br /><br />
<b>PHP Basic</b><br />
<a class="left" target="_top" href="default.asp" >PHP HOME</a><br />
<a class="left" target="_top" href="php_intro.asp" >PHP Intro</a><br />
<a class="left" target="_top" href="php_install.asp" >PHP Install</a><br />
<a class="left" target="_top" href="php_syntax.asp" style='font-weight:bold;'>PHP Syntax</a><br />
<a class="left" target="_top" href="php_variables.asp" >PHP Variables</a><br />
<a class="left" target="_top" href="php_string.asp" >PHP String</a><br />
<a class="left" target="_top" href="php_operators.asp" >PHP Operators</a><br />
<a class="left" target="_top" href="php_if_else.asp" >PHP If...Else</a><br />
<a class="left" target="_top" href="php_switch.asp" >PHP Switch</a><br />
<a class="left" target="_top" href="php_arrays.asp" >PHP Arrays</a><br />
<a class="left" target="_top" href="php_looping.asp" >PHP Looping</a><br />
<a class="left" target="_top" href="php_functions.asp" >PHP Functions</a><br />
<a class="left" target="_top" href="php_forms.asp" >PHP Forms</a><br />
<a class="left" target="_top" href="php_get.asp" >PHP $_GET</a><br />
<a class="left" target="_top" href="php_post.asp" >PHP $_POST</a><br />
<br />
<b>PHP Advanced</b><br />
<a class="left" target="_top" href="php_date.asp" >PHP Date</a><br />
<a class="left" target="_top" href="php_includes.asp" >PHP Include</a><br />
<a class="left" target="_top" href="php_file.asp" >PHP File</a><br />
<a class="left" target="_top" href="php_file_upload.asp" >PHP File Upload</a><br />
<a class="left" target="_top" href="php_cookies.asp" >PHP Cookies</a><br />
<a class="left" target="_top" href="php_sessions.asp" >PHP Sessions</a><br />
<a class="left" target="_top" href="php_mail.asp" >PHP E-mail</a><br />
<a class="left" target="_top" href="php_secure_mail.asp" >PHP Secure E-mail</a><br />
<a class="left" target="_top" href="php_error.asp" >PHP Error</a><br />
<a class="left" target="_top" href="php_exception.asp" >PHP Exception</a><br />
<a class="left" target="_top" href="php_filter.asp" >PHP Filter</a><br />
<br />
<b>PHP Database</b><br />
<a class="left" target="_top" href="php_mysql_intro.asp" >MySQL Introduction</a><br />
<a class="left" target="_top" href="php_mysql_connect.asp" >MySQL Connect</a><br />
<a class="left" target="_top" href="php_mysql_create.asp" >MySQL Create</a><br />
<a class="left" target="_top" href="php_mysql_insert.asp" >MySQL Insert</a><br />
<a class="left" target="_top" href="php_mysql_select.asp" >MySQL Select</a><br />
<a class="left" target="_top" href="php_mysql_where.asp" >MySQL Where</a><br />
<a class="left" target="_top" href="php_mysql_order_by.asp" >MySQL Order By</a><br />
<a class="left" target="_top" href="php_mysql_update.asp" >MySQL Update</a><br />
<a class="left" target="_top" href="php_mysql_delete.asp" >MySQL Delete</a><br />
<a class="left" target="_top" href="php_db_odbc.asp" >PHP ODBC</a><br />
<br />
<b>PHP XML</b><br />
<a class="left" target="_top" href="php_xml_parser_expat.asp" >XML Expat Parser</a><br />
<a class="left" target="_top" href="php_xml_dom.asp" >XML DOM</a><br />
<a class="left" target="_top" href="php_xml_simplexml.asp" >XML SimpleXML</a><br />
<br />
<b>PHP and AJAX</b><br />
<a class="left" target="_top" href="php_ajax_intro.asp" >AJAX Introduction</a><br />
<a class="left" target="_top" href="php_ajax_xmlhttprequest.asp" >XMLHttpRequest</a><br />
<a class="left" target="_top" href="php_ajax_suggest.asp" >AJAX Suggest</a><br />
<a class="left" target="_top" href="php_ajax_xml.asp" >AJAX XML</a><br />
<a class="left" target="_top" href="php_ajax_database.asp" >AJAX Database</a><br />
<a class="left" target="_top" href="php_ajax_responsexml.asp" >AJAX responseXML</a><br />
<a class="left" target="_top" href="php_ajax_livesearch.asp" >AJAX Live Search</a><br />
<a class="left" target="_top" href="php_ajax_rss_reader.asp" >AJAX RSS Reader</a><br />
<a class="left" target="_top" href="php_ajax_poll.asp" >AJAX Poll</a><br />
<br />
<b>PHP Reference</b><br />
<a class="left" target="_top" href="php_ref_array.asp" >PHP Array</a><br />
<a class="left" target="_top" href="php_ref_calendar.asp" >PHP Calendar</a><br />
<a class="left" target="_top" href="php_ref_date.asp" >PHP Date</a><br />
<a class="left" target="_top" href="php_ref_directory.asp" >PHP Directory</a><br />
<a class="left" target="_top" href="php_ref_error.asp" >PHP Error</a><br />
<a class="left" target="_top" href="php_ref_filesystem.asp" >PHP Filesystem</a><br />
<a class="left" target="_top" href="php_ref_filter.asp" >PHP Filter</a><br />
<a class="left" target="_top" href="php_ref_ftp.asp" >PHP FTP</a><br />
<a class="left" target="_top" href="php_ref_http.asp" >PHP HTTP</a><br />
<a class="left" target="_top" href="php_ref_libxml.asp" >PHP Libxml</a><br />
<a class="left" target="_top" href="php_ref_mail.asp" >PHP Mail</a><br />
<a class="left" target="_top" href="php_ref_math.asp" >PHP Math</a><br />
<a class="left" target="_top" href="php_ref_misc.asp" >PHP Misc</a><br />
<a class="left" target="_top" href="php_ref_mysql.asp" >PHP MySQL</a><br />
<a class="left" target="_top" href="php_ref_simplexml.asp" >PHP SimpleXML</a><br />
<a class="left" target="_top" href="php_ref_string.asp" >PHP String</a><br />
<a class="left" target="_top" href="php_ref_xml.asp" >PHP XML</a><br />
<a class="left" target="_top" href="php_ref_zip.asp" >PHP Zip</a><br />
<br />
<b>PHP Quiz</b><br />
<a class="left" target="_top" href="php_quiz.asp" >PHP Quiz</a><br />
<!--<b>PHP XML</b><br />
<a class="left" target="_top" href="php_xml_parser.asp" >PHP Expat</a><br />
<a class="left" target="_top" href="php_xml.asp" >PHP XML</a><br />
<br />
<b>PHP Software</b><br />
<a class="left" target="_top" href="php_zend.asp" >Zend Studio</a><br />
--><br />
<b>Selected Reading</b><br />
<a class="left" target="_top" href="../browsers/browsers_stats.asp">Web Statistics</a><br />
<a class="left" target="_top" href="../site/site_glossary.asp">Web Glossary</a><br />
<a class="left" target="_top" href="../hosting/default.asp">Web Hosting</a><br />
<a class="left" target="_top" href="../quality/default.asp">Web Quality</a><br /><br />
<a class="left" target="_top" href="../forum/default.asp">W3Schools Forum</a><br /><br />
<a class="left" target="_top" href="../about/about_helping.asp">Helping W3Schools</a><br /><br />
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*LeftLinkUnit*/
google_ad_slot = "4854527104";
google_ad_width = 120;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td>
<td valign="top">
<table style="border: 1px solid gray" width="100%" bgcolor="#FFFFFF" border="0" cellpadding="5" cellspacing="0">
<tr>
<td>
<h1>PHP Syntax</h1>
<a href="php_install.asp"><img alt="previous" border="0" src="../images/btn_previous.gif" width="100" height="20" /></a>
<a href="php_variables.asp"><img alt="next" border="0" src="../images/btn_next.gif" width="100" height="20" /></a>
<hr />
<p class="intro">You cannot view the PHP source code by selecting "View source" in
the browser - you will
only see the output from the PHP file, which is plain HTML. This is because the scripts
are executed on the server before the result is sent back to the browser.</p>
<hr />
<h2>Basic PHP Syntax</h2>
<p>A PHP scripting block always starts with <b><?php</b> and ends with <b>?></b>.
A PHP scripting block can be placed anywhere in the document.</p>
<p>On servers with shorthand support enabled you can start a scripting
block with <? and end with ?>.</p>
<p>However, for maximum compatibility, we recommend that you use the standard
form (<?php) rather than the shorthand form.</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table1"><tr><td>
<pre><?php</pre>
<pre>?></pre>
</td></tr></table>
<p>A PHP file normally contains HTML tags, just like an HTML file, and some PHP
scripting code.</p>
<p>Below, we have an example of a simple PHP script which sends the text
"Hello World" to the browser:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre><html>
<body></pre>
<pre><?php
echo "Hello World";
⌨️ 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 + -