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Bug #15866 using echo for expression 3 in for loop creates parse error
Submitted: 2002-03-04 23:31 UTC Modified: 2002-03-05 01:44 UTC
From: chunky_ at hotmail dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 4.0.6 OS: Linux
Private report: No CVE-ID: None
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 [2002-03-04 23:31 UTC] chunky_ at hotmail dot com 
Using Echo in expression 3 of a for loop creates a parse error.

For instance:

$blah = (0,1,2,3,4,5,6,7,8,9);
for ($i = 0; $i < 10; echo $blah[$i++]);

results in this error:

Parse error: parse error, expecting `')'' in /home/chunky/public_html/test.php on line XX (line of for loop)

However, this will parse properly:

$blah = (0,1,2,3,4,5,6,7,8,9);
for ($i = 0; $i < 10; print $blah[$i++]);

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 [2002-03-05 00:19 UTC] mfischer@php.net 
I've found such differences some time ago (but didn't care about it yet).

E.g.

<? $a = (echo "test\n"); var_dump($a); ?>  <-- parser error
<? $a = (print "test\n"); var_dump($a); ?> <-- outputs 1

'print' always evals to int(1)
 [2002-03-05 00:22 UTC] mfischer@php.net 
The last sentence if wrong. print actually returns a value (as stated in the manual), maybe that's the difference.
 [2002-03-05 01:29 UTC] derick@php.net 
echo is a language construct and not a function. It's different this way from print which is a function (a built-in one).
Not a bug -> Bogus

Derick
 [2002-03-05 01:44 UTC] mfischer@php.net 
The something else is bogus too. From the manual:

echo() is not actually a function (it is a language construct) ...

and

print() is not actually a function (it is a language construct) ....

So the phrase "is a language construct" alone doesn't weight much. There *is* a difference, but it's not the 'being a language construct'.
 
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