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PHP书写格式详解(必看),php书写详解必看
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PHP书写格式详解(必看),php书写详解必看

Jun 13, 2016 am 08:38 AM
php

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:

<&#63;php 
echo "你好!"; 
&#63;> 
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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 
  
  
 

<&#63;php echo "你好!"; &#63;>

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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):

<&#63;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."; 
&#63;> 
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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.

<&#63;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]}"; 
&#63;> 
Copy after login

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):

<&#63;php 
print "<h2 id="PHP-is-fun">PHP is fun!</h2>"; 
print "Hello world!<br>"; 
print "I'm about to learn PHP!"; 
&#63;> 
Copy after login

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:

<&#63;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]}"; 
&#63;> 
Copy after login

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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