指令分隔符

同 C 或 Perl 一样,PHP 需要在每个语句后用分号结束指令。一段 PHP 代码中的结束标记隐含表示了一个分号;在一个 PHP 代码段中的最后一行可以不用分号结束。如果后面还有新行,则代码段的结束标记包含了行结束。

示例 #1 包含末尾换行符的结束标记的例子

<?php echo "Some text"; ?>
No newline
<?= "But newline now" ?>

以上示例会输出:

Some textNo newline
But newline now

进入和退出 PHP 解析的例子:

<?php
echo 'This is a test';
?>

<?php echo 'This is a test' ?>

<?php echo 'We omitted the last closing tag';

注意:

文件末尾的 PHP 代码段结束标记可以不要,有些情况下当使用 include 或者 require 时省略掉会更好些,这样不期望的空白符就不会出现在文件末尾,之后仍然可以输出响应标头。在使用输出缓冲时也很便利,就不会看到由包含文件生成的不期望的空白符。

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User Contributed Notes 3 notes

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55
Krishna Srikanth
17 years ago
Do not mis interpret

<?php echo 'Ending tag excluded';

with

<?php echo 'Ending tag excluded';
<
p>But html is still visible</p>

The second one would give error. Exclude ?> if you no more html to write after the code.
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3
M1001
2 years ago
You are also able to write more than one statement in one line, just separating with a semicolon, example:

<?php
echo "a"; echo "b"; echo "c";
#The output will be "abc" with no errors
?>
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0
moonlander12341234 at gmail dot com
3 months ago
A user from stack overflow had a nice explanation for the trailing newline, simply put,

<?= "Hello" ?>
Jello

would output,

HelloJello

meaning that implicit newline from the ?> tag is not there, however one can simply add that to the code such as,

<?= "Hello" ?>

Jello

the space between acts as a new line after the closing tag
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