Difference between echo and print in PHP

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";

From:
http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40