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What is the difference between the PHP open tags “<?=” and “<?php”/“<?”?

不是类型:

<?php echo $foo; ?>

I have seen it written

<?= $foo; ?>

但我常常想知道,这样做的风险/做法是什么? 公正。感谢!

Answer 1

如果您将守则移至short_ open_tag的环境。凭空,你可以找到许多内部变量名称(安全问题),并拥有大量受损产出。

另一边是,允许使用<代码><的相同术语? 同样,让你打开只有<代码><的PHP标签;,从而使其残疾不仅会暴露你试图展示的具体变量,而且会在短标内显示任何PHP代码。

Answer 2

第二种选择提高了可读性。第一项确保了其他系统的可运输性。

除此以外,没有任何差别......

Answer 3

它不可运输。有一个预设结构,可以将其撤销,这样,如果你把手稿移至残疾地点,就会打破。

此外,我认为,这不够明确。 <代码><?= func() ?> and <? func();?>易于误解,但很重要。

Answer 4

You can only use <? and <?= if short tags are enabled when you are running PHP. The actual reason not to use it is because it s incompatible with an xml declaration. If you are trying to output xml with a php extension and you have short tags enabled, you have to do something like <<??>? .. I suppose you can just echo a string.

Answer 5

我不理解所有这种便携式话。

There is ALWAYS a portability issue.
There can be no apache - so, don t use mod_rewrite.
There can be no PDO - so, don t use prepared statements.
There can be no mysql - so, don t use complex queries.
There can be no PHP - so, plain HTML is most compatible format, never use anything else because of portability issues!

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