输出方式

1. echo

echo 是一个语言结构，有无括号均可使用：echo 或 echo()。

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）：

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

输出结果:

PHP is enjoyable!
Hello world!
I'm about to learn PHP!
This string was made with multiple parameters.

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
$text1 = "Learn PHP";
$text2 = "testtest";
$vehicles = array("Volvo", "BMW", "SAAB");

echo $text1;
echo "<br>";
echo "Study PHP at $text2";
echo "<br>";
echo "My car is a {$vehicles[0]}";
?>

输出结果:

Learn PHP
testtest
My car is a Volvo

2. PHP print 语句

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

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）：

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

输出结果:

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

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
$text1 = "Learn PHP";
$text2 = "Example.com";
$vehicles = array("Volvo", "BMW", "SAAB");

print $text1;
print "<br>";
print "Study PHP at $text2";
print "<br>";
print "My car is a {$vehicles[0]}";
?>

输出结果:

Learn PHP
Study PHP at Example.com
My car is a Volvo

3. echo print的差异

• echo - 能够输出一个以上的字符串
• print - 只能输出一个字符串，并始终返回 1

由于echo不返回任何值, 所以 echo比print稍快