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Bug #29082 Variable call line argument problem
Submitted: 2004-07-10 08:10 UTC Modified: 2004-07-10 20:30 UTC
From: markem at ev1 dot net Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 4CVS-2004-07-10 (stable) OS: Windows98se
Private report: No CVE-ID: None
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 [2004-07-10 08:10 UTC] markem at ev1 dot net 
Description:
------------
File #1:
################################################################################
#	HTML Library
################################################################################
#	Begin Table
################################################################################
function tb( $alignA, $bgPicA, $bgColorA, $borderA, $borderColorA,
	$cellPaddingA, $cellSpacingA, $columnsA, $heightA, $widthA )
{
	$theReply = "<table ";

	if( isset($alignA) )$theReply .= "align='$alignA' ";
	if( isset($bgPicA) )$theReply .= "background='$bgPicA' ";
	if( isset($bgColorA) )$theReply .= "bgcolor='$bgColorA' ";
	if( isset($borderA) )$theReply .= "border='$borderA' ";
	if( isset($borderColorA) )$theReply .= "bordercolor='$borderColorA' ";
	if( isset($cellPaddingA) )$theReply .= "cellpadding='$cellPaddingA' ";
	if( isset($cellSpacingA) )$theReply .= "cellspacing='$cellSpacingA' ";
	if( isset($columnsA) )$theReply .= "columns='$columnsA' ";
	if( isset($heightA) )$theReply .= "height='$heightA' ";
	if( isset($widthA) )$theReply .= "width='$widthA' ";

	$theReply .= ">";
	return $theReply;
}

File #2: (test program)
<?php
	include	"html.php";
	$theLine = "";
	$theLine .= tb( null,null,"#FFFFFF");
	echo "$theLine\n";
?>

Running the above generates:

C:\apache\lib>php test.php
Content-type: text/html
X-Powered-By: PHP/4.3.1

PHP Warning:  Missing argument 4 for tb() in c:\apache\lib\html.php on line 7
PHP Warning:  Missing argument 5 for tb() in c:\apache\lib\html.php on line 7
PHP Warning:  Missing argument 6 for tb() in c:\apache\lib\html.php on line 8
PHP Warning:  Missing argument 7 for tb() in c:\apache\lib\html.php on line 8
PHP Warning:  Missing argument 8 for tb() in c:\apache\lib\html.php on line 8
PHP Warning:  Missing argument 9 for tb() in c:\apache\lib\html.php on line 8
PHP Warning:  Missing argument 10 for tb() in c:\apache\lib\html.php on line 8
<table bgcolor='#FFFFFF' ><tr ><td ></td></tr></table>



Expected result:
----------------
1. If not having to pass arguments to a function (variable call arguments) is normal, then why does PHP generate a warning about missing arguments?

2. If variable call arguments are possible - why can you not call the function in this manner:

      $theLine .= tb(,,"#ffffff");

???????  PHP should treat the empty ",," as two nulls.  Instead, an error is generated by PHP and PHP dies.

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 [2004-07-10 14:25 UTC] derick@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.

.
 [2004-07-10 20:30 UTC] markem at ev1 dot net 
Ok.  I went back to the O'Reilly book and re-read the section on "Missing Parameters" on page 69 of the March 2002, First Edition.  I see where the warning message is stated to occur and I know about the suppression of the warning messages.  I can live with that.

This leaves me with question #2.  That of why the null parameters are not being interpreted as null parameters and instead PHP dies when it attempts to interpret them.  I feel that this is a valid problem as, in some (but not all) other languages the empty set on call lines simply becomes a null value.  Further, PHP's dying in this case negates the "Missing Parameters" section on page 69.

I will though, go talk with people on the help boards and see what they say about this.

Thanks for you time and sorry about #1.

Later!

Mark
 
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