Beginning PHP: Error Report

danielbendaniel · April 14th, 2004, 03:39 AM

In Chapter 3 of the Book Begining PHP, i have been accessing using $_GET, but each time I use a quotation in front of echo, it brings an erro. So I have to put my statement before echo, and just put the variable i want to display after echo i.e. What is your name
echo $_GET["name"];
And it works this way.

But further down with LIST boxes, it was always bringing this error message when trying the codes:Parse error: parse error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING in C:\Inetpub\wwwroot\listbox.php on line 5.

When I manipulated the following codes as the one in the book was giving me error:
<html>
<head></head>
<body>
Price Range:
<?php
echo $_GET['Price'];
?>
Engine Size(s):
<?php
echo $_GET['EngineSize[0]'];
echo $_GET['EngineSize[1]'];
echo $_GET['EngineSize[2]'];
echo $_GET['EngineSize[3]'];
?>
</body>
</html>

Then as I tugg to the browser upon request, it brought the following response:

Price Range: $5,000-$10,000Engine Size(s):
Notice: Undefined index: EngineSize[0] in C:\Inetpub\wwwroot\listbox.php on line 10

Notice: Undefined index: EngineSize[1] in C:\Inetpub\wwwroot\listbox.php on line 11

Notice: Undefined index: EngineSize[2] in C:\Inetpub\wwwroot\listbox.php on line 12

Notice: Undefined index: EngineSize[3] in C:\Inetpub\wwwroot\listbox.php on line 13

I tried the new instruction that we should access data via superglobal arrays using the following code:<html>
<head></head>
<body>
Price Range:
Engine Size(s):
<?php
echo $_GET['Price'];
echo $_GET['EngineSize[0]'];
echo $_GET['EngineSize[1]'];
echo $_GET['EngineSize[2]'];
echo $_GET['EngineSize[3]'];
?>
</body>
</html>

It gave me the following response:
Price Range: Engine Size(s): $5,000-$10,000
Notice: Undefined index: EngineSize[0] in C:\Inetpub\wwwroot\listbox.php on line 8

Notice: Undefined index: EngineSize[1] in C:\Inetpub\wwwroot\listbox.php on line 9

Notice: Undefined index: EngineSize[2] in C:\Inetpub\wwwroot\listbox.php on line 10

Notice: Undefined index: EngineSize[3] in C:\Inetpub\wwwroot\listbox.php on line 11

Also further down using the hidden fields, the info was fully displayed as against the directive to hide them i.e. "Bugs Bunny", "Homer Simpson", "Reny & Stimpy". Also as I click the submit button, it gives an error "Undifined Variables"

Please look into all these observation, as they are really slowing me down. I am still a babie in PHP.

Daniel

richard.york · April 14th, 2004, 03:54 AM

This is a common misconception, multi-dimensional arrays are formed by appending additional levels. Since $_GET is already an array, extra levels are just appended to the end.

Take for instance the following query string:

/index.php?EngineSide[0]=1

This would be represented with PHP using:

<?php
echo $_GET['EngineSize'][0];
?>

Second before you output a variable or constant you'll want to be sure that it exists first.

if (isset($_GET['EngineSize'][0]))
{
echo $_GET['EngineSize'][0];
}

PHP will temporarily create a copy of the variable in memory will null value if the variable does not exist and you try to use it. Then it'll spit out a E_NOTICE level error complaining that it didn't exist.

Also, make sure that the method attribute of your HTML form is set to get, because if I remember right this example used the post method. If its set to the post method you'll want to use the $_POST superglobal array instead of $_GET.

hth,
Rich

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