问题描述
它们的安全性是否相等?我被告知使用
Are they equal in safeness? I was informed that using
<?=$function_here?>
不太安全，并且减慢了页面加载时间.我严格偏向使用echo.
was less safe, and that it slows down page load times.I am strictly biased to using echo.
优点/缺点是什么?
推荐答案
<?和<?=被称为短打开标记，并且并不总是启用的(请参见 short_open_tag 指令)，且PHP 5.3或更低版本(但自PHP 5.4.0起，<?=始终可用).
<? and <?= are called short open tags, and are not always enabled (see the short_open_tag directive) with PHP 5.3 or below (but since PHP 5.4.0, <?= is always available).
实际上，在PHP 5.3.0随附的php.ini-production文件中，默认情况下将其禁用:
Actually, in the php.ini-production file provided with PHP 5.3.0, they are disabled by default:
$ grep 'short_open' php.ini-production
; short_open_tag
short_open_tag = Off
因此，在要分发的应用程序中使用它们可能不是一个好主意:如果未启用它们，则您的应用程序将无法工作.
So, using them in an application you want to distribute might not be a good idea: your application will not work if they are not enabled.
<?php －因此，即使写入时间更长，使用它也是最安全的.
<?php, on the other side, cannot be disabled -- so, it's safest to use this one, even if it is longer to write.
除了不一定要启用短开放标签之外，我认为没有太大区别.
Except the fact that short open tags are not necessarily enabled, I don't think there is much of a difference.
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