Definition and Usage 
定义和用法 
The echo() function outputs one or more s. 
echo()的作用是:输出一个或多个。 
Syntax 
语法 
echo(strings) 
Parameter参数 Description描述 
strings d. One or more strings to be sent to the output 
必要参数。指定一个或多个需要被发送到结果中的字符串 
Tips and Notes 
提示和注意点 
Note: The echo() function is not actually a function, so you are not required to use parentheses with it. However, if you want to pass more than one parameter to echo(), using parentheses will generate a parse error. 
注意:echo()函数不是一个真正意义上的函数,所以你没有必要一定去使用它。如果你想把多于一个的参数传递给echo()函数,那么使用圆括号“()”将产生错误。 
Tip: The echo() function is slightly faster than print(). 
提示:echo()函数相当于print()函数的简化版本。 
Tip: The echo() function has the following shortcut syntax. See example 5. 
提示:echo()函数包含下面的简便写法。具体见:案例5。 
Example 1 
案例1 
<?php $str = "Who's Kai Jim?"; echo $str; echo "<br />"; echo $str."<br />I don't know!"; ?>
The output of the code above will be: 
上述代码将输出下面的结果: 
Who's Kai Jim?Who's Kai Jim?I don't know! 
案例2
<?php echo "This textspans multiplelines."; ?>
The output of the code above will be: 
上述代码将输出下面的结果: 
This text spans multiple lines. 
案例3 
<?php echo 'This ','string ','was ','made ','with multiple parameters'; ?>
The output of the code above will be: 
上述代码将输出下面的结果: 
This string was made with multiple parameters 
案例4 
Difference of single and double quotes. Single quotes will print the variable name, not the value: 
区别单引号(')和双引号(”)的不同。单引号将输出,而不是变量的值: 
<?php $color = "red"; echo "Roses are $color"; echo "<br />"; echo 'Roses are $color'; ?>
The output of the code above will be: 
上述代码将输出下面的结果: 
Roses are redRoses are $color 
案例5 
Shortcut syntax: 
简写(捷径)语法: 
<html> <body> <?php $color = "red"; ?> <p>Roses are <?=$color?></p> </body> </html>
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