问题描述
有几种方法可以用PHP打印输出。包括但不限于：
There are several ways to print output in PHP; including but not limited to:
echo 'Hello';
echo ('Hello');
print 'Hello';
print ('Hello');
这四个之间是否有区别？另外，括号根本没有区别吗？
Are there any differences between these four? Also, do the parentheses make any difference at all?
推荐答案
两个区别：
print 具有返回值（总是1），而 echo 没有。因此 print 可以用作表达式。
print has a return value (always 1), echo doesn't. Therefore print can be used as an expression.
echo 接受多个参数。因此，您可以编写 echo $ a，$ b 而不是 echo $ a。 $ b 。
echo accepts multiple arguments. So you may write echo $a, $b instead of echo $a . $b.
关于括号：在我眼中，它们只是错误。它们根本没有功能。你也可以写 echo（（（（（（（（（（（（（（a [a））））））））））））$code>;人们通常会在无知中加上括号，以为 print 是一个函数。此外，它增加了误解的机会。例如 print（ foo）&& print（ bar）不打印 foobar ，因为PHP将此解释为 print（（ foo）& ;& print（ bar））。因此，即使外观不同，也会打印 bar1 。
Concerning the parentheses: They are simply wrong in my eyes. They have no function at all. You could as well write echo (((((((((($a)))))))))); people usually include parentheses from ignorance, thinking that print is a function. Furthermore it increases the chance of misinterpretation. For example print("foo") && print("bar") does not print foobar, because PHP interprets this as print(("foo") && print("bar")). So bar1 would be printed, even though it looks different.
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