PHP书写格式详解(必看),php书写详解必看
PHP书写格式详解(必看),php书写详解必看
从一个例子开始。
启动编辑器,创建一个php文件并键入如下代码:
<?php echo "你好!"; ?>
将该文件命名为 test.php 并存储于 E:html 目录下。
在浏览器地址栏里访问该 php 文件:http://127.0.0.1/test.php,输出结果如下:
你好!在该例子中,我们以 echo 指令输出一个字符串“你好!”。
从这个例子可以看出:
•PHP 文件或 PHP 代码段以“<?php”开头,以“?>”结束,中间为php代码
•每一个指令集以 ; 符号结束
•浏览器得到的为 PHP 解析器执行完 php 代码后的结果,网站浏览者不能查看到 php 文件的原始代码
当然,要输出标准的html代码,可以把上例完善为:
PHP 测试 <?php echo "你好!"; ?>
可见,PHP 代码可以和 XHTML 代码混写。
echo 是 PHP 内置的一个指令,用于输出1个或多个字符串,和 echo 类似的还有 print。
下面我们附带介绍一下php的输出函数。
PHP echo 和 print 语句
echo 和 print 区别:
•echo - 可以输出一个或多个字符串
•print - 只允许输出一个字符串,返回值总为 1
提示:echo 输出的速度比 print 快, echo 没有返回值,print有返回值1。
PHP echo 语句
echo 是一个语言结构,使用的时候可以不用加括号,也可以加上括号: echo 或 echo()。
1.显示字符串
下面的实例演示了如何使用 echo 命令输出字符串(字符串可以包含 HTML 标签):
<?php echo "<h2 id="PHP-is-fun">PHP is fun!</h2>"; echo "Hello world!<br>"; echo "I'm about to learn PHP!<br>"; echo "This", " string", " was", " made", " with multiple parameters."; ?>
2.显示变量
下面的实例演示了如何使用 echo 命令输出变量和字符串.
<?php $txt1="Learn PHP"; $txt2="manongjc.com"; $cars=array("Volvo","BMW","Toyota"); echo $txt1; echo "<br>"; echo "Study PHP at $txt2"; echo "My car is a {$cars[0]}"; ?>
PHP print 语句
print 同样是一个语言结构,可以使用括号,也可以不使用括号: print 或 print()。
1.显示字符串
下面的实例演示了如何使用 print 命令输出字符串(字符串可以包含 HTML 标签):
<?php print "<h2 id="PHP-is-fun">PHP is fun!</h2>"; print "Hello world!<br>"; print "I'm about to learn PHP!"; ?>
2.显示变量
下面的实例演示了如何使用 print 命令输出变量和字符串:
<?php $txt1="Learn PHP"; $txt2="manongjc.com"; $cars=array("Volvo","BMW","Toyota"); print $txt1; print "<br>"; print "Study PHP at $txt2"; print "My car is a {$cars[0]}"; ?>
以上这篇PHP书写格式详解(必看)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持帮客之家。

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