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ALL :: ZONES :: Returning Arrays from a Function
By: digitaltree U.S.A.  Date: 31/01/2003 00:00:00  English  Points: 30 Status: Answered
Quality : Excellent
Hi All

I need to know how to return an array from a function. Below is a class that I'm using one function sets the array the second should return the array, but current() gives and error!

<?php
class TEST
{
var $myArray = array();

function setArray($value)
{
array_push($this->myArray, $value);
}
function getArray()
{
return $this->myArray;
}
}

$myObj = new $TEST;
for ($a=0; $a==100; $a++)
{
$myObj->setArray($a);
}
$theArray = $myObj->getArray();
for ($a=0; $a==100; $a++)
{
echo(current($theArray)); // Error occurs here!
}
?>
By: VGR Date: 31/01/2003 20:08:00 English  Type : Answer
returning array pose no problem at all.

Do it like this :

--main script
$myArray=array();
$myArray=letsCall();

--anywhere you define the function letsCall()
function letsCall() {
$locarray=array();
// populate $locarray
return($locarray);
}


a better solution is to use passed-by-reference (Var) parameters, like :
--main script
$myArray=array();
$returnvalue=letsCall($myArray);

--anywhere you define the function letsCall()
function letsCall(&$par) { // Var parameter
$resultat=TRUE;
// populate $par as array, $resultat=FALSE on errors
return($resultat);
}

I guess you can adapt this to your OO-style
By: Hatemben Date: 31/01/2003 20:25:00 English  Type : Comment
Hello,

First : $myObj = new TEST;

Second, $a==100 will be false, and the for statement will exit withou setting any array value :

DON'T DO
for ($a=0; $a==100; $a++)
{
$myObj->setArray($a);
}

DO:
for ($a=0; $a<=100; $a++)
{
$myObj->setArray($a);
}

And finally to print an array values use
foreach($theArray as $key=>$val)
{
echo $val;
}

And combining those your script will be :

<?php
class TEST
{
var $myArray = array();

function setArray($value)
{
array_push($this->myArray, $value);
}
function getArray()
{
return $this->myArray;
}
}

$myObj = new TEST;
for ($a=0; $a<=100; $a++)
{
$myObj->setArray($a);
}
$theArray = $myObj->getArray();

foreach($theArray as $key=>$val)
{
echo $val;
}

?>
By: waygood Date: 31/01/2003 21:19:00 English  Type : Comment
as an addition to the correct answer above

print_r($your_array);

This is a quick coding way to display the contents of an array for debugging. It's a little slow but you don't have to worry about multidimensional arrays, as this will display any structure and it will show the indexes/keys.
By: RQuadling Date: 31/01/2003 21:35:00 English  Type : Comment
In addition to waygood's comment.

If you are using print_r in an already populated HTML page, add

echo "<pre>";
print_r($array);
echo "</pre>";

Otherwise the output will all be written as 1 line in the HTML page as print_r does not include HTML formatting for line breaks.

You can't use nl2br in print_r as the return value from print_r is an integer and not the array dump.

Richard.
By: VGR Date: 31/01/2003 22:03:00 English  Type : Comment
Althought I never use print_r(), I learned something Richard ;-)
many thanks 8-)
By: RQuadling Date: 31/01/2003 22:10:00 English  Type : Comment
Some other things which may help.

/ Get cookies
if (isset($_COOKIE))
{
$Cookie = $_COOKIE;
$Cookie["COOKIE"] = "COOKIE";
}
if (isset($HTTP_COOKIE_VARS))
{
$Cookie = $HTTP_COOKIE_VARS;
$Cookie["COOKIE"] = "HTTP_COOKIE_VARS";
}

// Get Post
if (isset($_POST))
{
$Post = $_POST;
$Post["POST"] = "POST";
}
if (isset($HTTP_POST_VARS))
{
$Post = $HTTP_POST_VARS;
$Post["POST"] = "HTTP_POST_VARS";
}

// Get GET
if (isset($_GET))
{
$Get = $_GET;
$Get["GET"] = "GET";
}
if (isset($HTTP_GET_VARS))
{
$Get = $HTTP_GET_VARS;
$Get["GET"] = "HTTP_GET_VARS";
}

if (isset($Get["DEBUG"]) && ($Get["DEBUG"] == "Yes"))
{
echo "<pre>";
print_r($Get);
print_r($Post);
print_r($Cookie);
echo "</pre>";
}

Allows you to write old and new PHP code in the same script and handle all the data coming in without worrying.

So nearly all my scripts I can add &DEBUG=Yes to the end and get a whole set of debugs (only a short example shown above!).

Richard.

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