Description:
------------
The comma-separated return string from a user-defined function sometimes (about 20%, erratically) returns a pipe ('|') separated return string instead of a comma-separated string.

The function works through a two-dimensional array, applying scaling factors to some elements and returning the modified first-dimension array.  The example code below has been abbreviated by removing conditional (if-else) blocks for simplification.

This problem has been traced by writing the return out to a log file, clips of which are listed below.

This code worked fine in PHP 4, but became erratice after upgrade to PHP5.

Note also that following upgrade to PHP 5 that the code failed fatally until the "if(!function_exists('calcPrice')){" condition was added.

Reproduce code:
---------------
if(!function_exists('calcPrice')){
	function calcPrice($prod){
		global $vat;					
		global $cFactor;
		global $lessonData;

		$curr = $lessonData[$prod]['currentPrice'];
		$name = $lessonData[$prod]['name'];

		$v = ($curr*$lessonData[$prod]['netVATrate'])*0.01;
		$p0 = $cFactor * ($curr+$v);
		return (  "$prod,$p0,$curr,$name,0");	
		}
	}
}
foreach($lsnArray as $value){	# $lsnArray is external
$p = calcPrice($value);

# For reasons which escape me entirely, the 
# function calcPrice() periodically returns 
# a string with '|' separators instead of  ','  !!!!!! 

$item = str_replace( "|", ",",$p);    # work-around solution

$pricelist .= "&$value=$item";	      # Required URL-encoded output
		 
fwrite($LOG, "\r\nPricelist element: $value=$p");   # TRACE


Expected result:
----------------
Log file clip, achieved about 80% of instances (erratic):

Pricelist increment: INTR=INTR,0,0.00,Introduction to Tutor,0
Pricelist increment: OV01=OV01,11.75,10.00,Overview of the PRINCE2 Pricelist increment: OV02=OV02,15.275,13.00,Principles of PRINCE2,0
Pricelist increment: BC01=BC01,12.925,11.00,Business Case,0
Pricelist increment: OR01=OR01,16.45,14.00,Project Organisation,0
Pricelist increment: PR01=PR01,29.9625,25.50,Overview of PRINCE2 Processes,0
...
etc


Actual result:
--------------
Log file clip, actual about 20% of instances (erratic):

Pricelist increment: INTR=INTR|0|0|Introduction to Tutor|0
Pricelist increment: OV01=OV01|11.75|10|Overview of the PRINCE2 Method|0
Pricelist increment: OV02=OV02|15.275|13|Principles of PRINCE2|0
Pricelist increment: BC01=BC01|12.925|11|Business Case|0
Pricelist increment: OR01=OR01|16.45|14|Project Organisation|0
Pricelist increment: PR01=PR01|29.962|25.5|Overview of PRINCE2 Processes|0
...
etc