PHP echo函数返回值与内部函数echo [英] PHP echo function return value vs echo inside function

问题描述

通常，我将这样编写一个函数:

Typically, I'll write a function like so:

function alertClass($field,$full=false){
 global $formErrors;
 $html = $full ? ' class="alert"' : ' alert';
 if (!empty($formErrors[$field])) return $html;
}

，然后在希望HTML显示的位置回显该函数的返回值，如下所示:

and then where I want the html to show I'll echo the return value of the function like so:

echo alertClass('somefield')

但是今天我在想为什么不只将echo放入函数中而不使用返回值呢? 因此，它不是返回$ html"，而是"echo $ html" ... 一种或另一种方式有优势吗?

but today I was thinking why not just put the echo in the function instead of using it's return value? So instead of "return $html" it would be "echo $html"... Is there an advantage to one way or the other?

推荐答案

例如，当您像这样将文本从函数中回显时...

for example when you echo the text out of your function just like this...

function yourStatus(){
   echo ' Done';
}

echo 'Status ='. yourStatus();

您的输出将如下所示

"DoneStatus ="

代替

"Status = Done"

欢呼

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