Description:
------------
PHP has always tolerated one trailing comma (,) at the end of array declaration, producing no error. I assume this is intended to easily generate array-syntax compliant php code in a loop.
<?php
/* Array context */
$a = array();          // works fine
// $a = array(,);      // will not work: Parse error: syntax error, unexpected ',', expecting ')'
$a = array(1,2);       // works fine
$a = array(1,2,);      // works fine : PHP syntax tolerance : last comma is ignored
//$a = array(1,2,3,,); // will not work: Parse error: syntax error, unexpected ',', expecting ')'
?>

It would be great to have PHP behaving the same way in function declaration and function call parameters contexts.

Reproduce code:
---------------
<?php
/* function declaration context */
function myfunction ()     {return true;}    // works
//function myfunction1 (,){return true;}     // will not work: Parse error: syntax error, unexpected ')', expecting '&' or T_VARIABLE
function myfunction2($a,$b){return true;}    // works
//function myfunction3($a,$b,){return true;} // will not work (should have): Parse error: syntax error, unexpected ')', expecting '&' or T_VARIABLE

/* function call context */
myfunction();           // works fine
//myfunction2(,);       // will not work: throws Parse error: syntax error, unexpected ',', expecting ')'
myfunction3($a,$a);     // works fine
//myfunction4($a,$a,);  // will not work (should have): throws Parse error: syntax error, unexpected ')'

Expected result:
----------------
<?php
// This declaration shouldn't raise any parse error
function myfunction3($a,$b,){return true;}
// neither does this function call :
myfunction4(1,2,);
// in either cases, the last comma should just be silently ignored by the parser.

Actual result:
--------------
<?php
function myfunction3($a,$b,){return true;} 
// Parse error: syntax error, unexpected ')', expecting '&' or T_VARIABLE

myfunction4($a,$a,);  
// Parse error: syntax error, unexpected ')'