I came across an interesting problem today which I have found a work
around but was wondering if anyone on the list had a better way to solve
this problem.
Been writing some php scripts on a Linux system using PHP 4.2.2. Basic
script works just fine there and does what is needed.
Moved this script over to a system running PHP 4.3.6 (and subsequently
to one running PHP 4.3.4) and found the script dumping a tremendous
number of warning messages.
Tracked this down to my use of arrays and the list and explode
functions.
working example code follows:
<?php
$arrayvalues = array("alpha" => 1, "beta" => 2, "gamma" => 3);
$data = array("alpha=first", "junk", "beta=last");
$numvalues = count($data);
for($i=0;$i < $numvalues;$i++)
{
@list($parameter, $value) = explode("=",$data[$i]);
if(isset($arrayvalues[$parameter]))
{
switch($arrayvalues[$parameter])
{
case $arrayvalues["alpha"]:
// something useful
echo"test 1\n";
break;
case $arrayvalues["beta"]:
// do something else
echo"test 2\n";
break;
case $arrayvalues["gamma"]:
// do more stuff
echo"test 3\n";
break;
default:
// should never get here
echo"test 4\n";
break;
}
}
}
?>
The code above works as needed. The problems I had to sort out however
was how to suppress error messages from the list() function since in one
case there is no second parameter to store in the list variables. The
behavior between php 4.2.2 and php 4.3.x was different in this, 4.2.2
does not issue any warnings on that statement (without the @).
Similarly I had to add a test [the if(isset())] before letting the
switch statement evaluate the array value. Without that check there is
an error issued and the default statement in the switch is executed.
Which is kind of what I expected (except for the error). Again 4.2.2
does not issue any kind of warnings or errors on this.
The errors being reported under PHP 4.3.x are:
if the @ is removed:
PHP Notice: Undefined offset: 1 in /home/scot/work/testing/testone.php
on line 11
offset 1 has a value but in the one instance there is no offset 1
created by the explode function.
and if the isset test is removed:
PHP Notice: Undefined index: junk in
/home/scot/work/testing/testone.php on line 15
There is no "junk" index into the arrayvalues array.
I understand why these warnings are being issued, in both cases I
attempted to reference an element that does not exist or has not been
declared previously.
I was wondering if there is a better way to handle the error message
from the list() function other than just ignoring it. Or going
overboard and creating my own error handling functions.
--
Scot L. Harris <[EMAIL PROTECTED]>
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