php两种基本的输出方及实例详解

在 PHP 中，有两种基本的输出方法：echo 和 print。

echo 和 print 之间的差异：

echo - 输出一个或多个字符串，可以接受多个参数并且没有返回值。

print - 只能输出一个字符串，只能接受一个参数并且有返回值，并始终返回 1。

提示：echo 比 print 稍快，因为它不返回任何值。

PHP echo 语句

1.echo 是一个语言结构，有无括号均可使用：echo 或 echo();

2.显示字符串,下面的例子展示如何用 echo 命令来显示不同的字符串（同时请注意字符串中能包含 HTML 标记）

<?phpecho "<h2>PHP is fun!</h2>";echo(123);echo "<br>";echo("我爱php");echo "<br>";echo "Hello world!<br>";echo "I'm about to learn PHP!<br>";echo "This", " string", " was", " made", " with multiple parameters.";?>

效果:

PHP is fun!
123
我爱php
Hello world!
I'm about to learn PHP!
This string was made with multiple parameters.

3.显示变量,下面的例子展示如何用 echo 命令来显示字符串和变量;

<?php$txt1="Learn PHP";$txt2="W3School.com.cn";$cars=array("Volvo","BMW","SAAB");echo $txt1;echo "<br>";echo "Study PHP at $txt2 <br />";echo "My car is a {$cars[0]}";?>

效果:

Learn PHP
Study PHP at W3School.com.cn
My car is a Volvo

PHP print 语句

1、print 也是语言结构，有无括号均可使用：print 或 print()。

2、显示字符串,下面的例子展示如何用 print 命令来显示不同的字符串（同时请注意字符串中能包含 HTML 标记）：

<?phpprint "<h2>PHP is fun!</h2>";print "Hello world!<br>";print "I'm about to learn PHP!";?>

效果:

PHP is fun!
Hello world!
I'm about to learn PHP!

3.显示变量,下面的例子展示如何用 print 命令来显示字符串和变量：

<?php$txt1="Learn PHP";$txt2="W3School.com.cn";$cars=array("Volvo","BMW","SAAB");print $txt1;print "<br>";print "Study PHP at $txt2 <br>";print "My car is a {$cars[0]}";?>

效果:

Learn PHP
Study PHP at W3School.com.cn
My car is a Volvo

到此这篇关于php两种基本的输出方及实例详解的文章就介绍到这了，希望大家以后多多支持好二三四！

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