xnanoob : XNA สำหรับ NOOBIEs (ใครไม่ noob เรา noob)

ดีค่า วันนี้มาดูความแตกต่างระหว่าง print และ echo อยู่ด้านล่าง แปลเองเด้อ  นำมาแปะไว้

บายค่า

1. Speed.  There is a difference between the two, but speed-wise it

should be irrelevant which one you use.  echo is marginally faster 

since

it doesn't set a return value if you really want to get down to the

nitty gritty.  

2. Expression.  print() behaves like a function in that you can do: 

$ret = print "Hello World"; And $ret will be 1.  That means that print

can be used as part of a more complex expression where echo cannot.  

An example from the PHP Manual:

   $b ? print "true" : print "false";

print is also part of the precedence table which it needs to be if it  is to be used within 

a complex expression. It is just about at the bottom of the precedence list though. 

 Only "," AND, OR and XOR are lower.

3. Parameter(s).  The grammar is: echo expression [, expression[,expression] ... ] 

But echo ( expression, expression ) is not valid. 

This would be valid: echo ("howdy"),("partner"); the same as: echo

"howdy","partner";   (Putting the brackets in that simple example 

serves no purpose since there is no operator precedence issue with a single  

term like that.) So, echo without parentheses can take multiple parameters, 

which get concatenated: 

   echo  "and a ", 1, 2, 3;   // comma-separated without parentheses

   echo ("and a 123");        // just one parameter with parentheses

print() can only take one parameter:

   print ("and a 123");

   print  "and a 123";

source: http://www.forumnettr.com

            http://www.forumnettr.com/forum