Assigning class objects to variables

Cory Bosma

Looked all over for the answer to this but can't find it. Maybe I'm
searching for the wrong thing. I'm new to using classes in PHP.

Whenever I try and reference the member's ($line) properties or
functions I either get blank for properties or "Call to a member
function on a non-object" for functions. I'm sure I'm doing something
incorrectly with the assignment.

function LineGroup($classarray)
{
$groupout = "";

while ($line = each($classarray))
{
$groupout .= "<tr><td>".$line -> GetCat1Desc()."</td></tr>";
}

return $groupout;
}

also even when I try the following the same problem occurs

function LineGroup($classarray)
{
$groupout = "";

$groupout .= "<tr><td>".$classarray[0] ->
GetCat1Desc()."</td></tr>";

return $groupout;
}

Any help would be greatly appreciated.

Thanks, Cory

Jul 17 '05 #1

Henk Verhoeven

Hi Cory,

while ($line = each($classarray))
In general you should make loops like this:

reset($classarray);
while (list($key) = each($classarray)) {
$line =& $classarray[$key];

but this will work too:

reset($classarray);
while (list($key, $line) = each($classarray))

but has the disadvantage of copying each object in $classarray when it
is assigned to $line. Copying decreases performance and uses up memory
that is only freed at the end of your script.
$groupout .= "<tr><td>".$classarray[0]->GetCat1Desc(). "</td></tr>";

I do't know, maybe there is no element with index 0? try:
print_r($classarray);
then select "view source" in your browser, so that you can see what's in
the array under what keys.

Greetings,

Henk Verhoeven,
www.phpPeanuts.org.

BTW, i would expect:
$objectarray = array( new SomeClass('first'), new SomeClass('second') );

$classarray = array('someclass', 'someotherclass');
so that i can do:
if (in_array(get_class($objectarray[0]), $classarray) )
print "the class of object 0 is in the class array";

just a matter of avoiding misleading names.

Cory Bosma wrote: Looked all over for the answer to this but can't find it. Maybe I'm
searching for the wrong thing. I'm new to using classes in PHP.

Whenever I try and reference the member's ($line) properties or
functions I either get blank for properties or "Call to a member
function on a non-object" for functions. I'm sure I'm doing something
incorrectly with the assignment.

function LineGroup($classarray)
{
$groupout = "";

while ($line = each($classarray))
{
$groupout .= "<tr><td>".$line -> GetCat1Desc()."</td></tr>";
}

return $groupout;
}

also even when I try the following the same problem occurs

function LineGroup($classarray)
{
$groupout = "";

$groupout .= "<tr><td>".$classarray[0] ->
GetCat1Desc()."</td></tr>";

return $groupout;
}

Any help would be greatly appreciated.

Thanks, Cory

Jul 17 '05 #2