PHP echo [转]
PHP 语言中，echo 是一个最常用的内置函数。它的作用，就是输出一个或者多个字符串。
用 echo 输出一个字符串在 PHP 语法中，我们已经举过一个简单的 echo 的示例，如下：
<html><body> <?phpecho "Blabla.cn"?> </body></html>
返回的 HTML 结果是：
<html><body>Blabla.cn</body></html>
我们将这个例子再写复杂一点，加上 HTML 标记，如下：
<html><body><?phpecho "<h1 id="Blabla-cn">Blabla.cn</h1>"?></body></html>
返回的 HTML 结果是：
<html><body><h1 id="Blabla-cn">Blabla.cn</h1></body></html>
echo 也可以输出多个字符串，用逗号 DE<, DE<分隔。示例如下：
<html><body><?phpecho "woyouxian.net", " and ","blabla.cn"?></body></html>
返回的显示结果是：
woyouxian.net and blabla.cn
echo 还可以输出变量的值。示例如下：
<html><body><?php$a = "blabla.cn";echo $a?></body></html>
上面代码中，$a 是一个变量，$a 的值是 "blabla.cn"，用 echo 输出 $a 的值。
显示的结果是：
blabla.cn
再比如，输出两个变量的值：
<html><body><?php$a = "woyouxian.net "; $b = "blabla.cn";echo $a,$b?></body></html>
返回的显示结果是：
woyouxian.net blabla.cn
如果 echo 的字符串参数里含有变量，有两种情况：第一种是字符串参数用双引号，echo 输出变量的值；第二种是字符串参数使用单引号，则输出变量名。
字符串采用双引号的示例如下：
$a = "just in case"; echo "take the gun,$a";
返回的结果是：
take the gun,just in case
上例中，字符串采用双引号，在字符串里的变量输出变量的值。
再看字符串用单引号的情况。示例如下：
$a = "just in case";echo 'take the gun,$a';
在字符串使用单引号的情况下，返回的结果是输出变量名称，而不是变量的值：
take the gun,$a
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