PHP: Blank page, error reporting not functioning

Question

I am running into a blank page, and although I have told PHP to report all errors I still get nothing which leads me to believe it must be a syntax error. I can't find what it is though.

Here is the script I am working on:

test.php

<?php
ini_set('display_errors', '1');
require('database.php');

print("hello");

$config = new Config("lessons.db","data/");
$db = new Database($config, array('first', 'second', 'third', 'fourth'), true);

print_r($db->dumpToArray());
?>

database.php

<?php
    class Config {
        private
            $_db
            $_file,
            $_directory,
            $_delimiter,
            $_columns;

        public function __construct(string $file, string $directory = null, string $delimiter = "|")  {
            $_db = $directory.$file;
            $_directory = $directory;
            $_delimiter = $delimiter;
        } 
        public function db() {
            return $_db;
        }
        public function delimiter() {
            return $_delimiter;
        }

    }       
    class Database {
        private
            $_config,
            $_columns,
            $_rows,
            $_pointer;

        public function __construct(Config $config, array $constants = null, boolean $caseInsensitive = false)  {
            $_config = $config;
            is_readable ($_config->db())
                or exit ("The database cannot be read");
            if(!is_null($constants))
                $this->defineColumns($constants, $caseInsensitive);
            return;
        } 

        private function connect(string $method) {
            if (!($_pointer = @fopen($_config->db(), $method)) or printf("Unable to connect to database");
        }

        private function disconnect() {
            fclose($_pointer);
        }

        private function defineColumns($constants, $caseInsensitive) {
            for (var $i=0;$i<count($constants);$i++)
                define($constants[i], $i, $caseInsensitive);                
        }

        public function dumpToArray() {
            $arrayDump = explode($_config->delimiter(), file($_config->db(), FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES));
            return $arrayDump;
        }

        public function getRowByValue($column, $value) {
            $this->connect('r');
            $rowNumber = 0;
            while (!feof($_Pointer)) {
                $row = explode($_config->delimiter(), fgets($dbPointer, 1024));
                if ($row[$column] == $value) {
                    $this->disconnect();
                    return $row;
                }
                $rowNumber++;
            }
            $this->disconnect();
            return false;
        }       
    }
?>

Anyone can see what could be causing it?

I'd try php -l <filename> just to make sure it's not a syntax issue first. — hafichuk
– hafichuk, Commented Dec 6, 2011 at 14:28
@Flukey don't have access to them, I am on a strange corporate set up. — George Reith
– George Reith, Commented Dec 6, 2011 at 14:29
@hafichuk Do I need to modify that code? Never come across it. — George Reith
– George Reith, Commented Dec 6, 2011 at 14:30
When I can't access the error logs (or when the problem is unexpected behaviour rather than an actual error) and I don't have access to a debugger, I divide and conquer. Simply comment out the major section of code you think is causing the problem. Once you have the problem broadly localized, then start uncommenting blocks of code until the problem recurs. — dnagirl
– dnagirl, Commented Dec 6, 2011 at 14:37
Voting to close this question as too localized one. Asking people to find syntax errors for you is above the limits. — Your Common Sense
– Your Common Sense, Commented Dec 6, 2011 at 14:58

nine7ySix · Accepted Answer · 2011-12-06 14:55:43Z

1

I think require(database.php); should be require('database.php');.

Try changing that and see if it helps

Also, you're missing a semicolon on

return $arrayDump

EDIT

Okay, I'm not too sure, but try to remove the casting from the parameters of the functions.

So...

public function __construct(Config $config, array $constants = null, boolean $caseInsensitive = false)

Would be

public function __construct($config, $constants = null, $caseInsensitive = false)  {

I don't do much OOC in PHP, but just taking another shot.

edited Dec 6, 2011 at 14:55

answered Dec 6, 2011 at 14:27

nine7ySix

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5 Comments

nine7ySix Over a year ago

I just found a missing semicolon

George Reith Over a year ago

wow thanks mr eagle eyes, still white screening though. Updated source.

nine7ySix Over a year ago

I'm not sure, but you may want to check the last line of the __construct function in the Database class. I may be wrong, but it's not returning anything

George Reith Over a year ago

I didn't think you had to but I may be wrong. Although even if I set it to return true; it still white screens =/

George Reith Over a year ago

I found a way to get error reporting on a different server and that was one of the problems along with a missing colon and bracket. I will accept your answer for finding the most errors :)

Mike B · Accepted Answer · 2011-12-06 14:25:12Z

1

At first glance... This won't fly

$db = new Database($config, ["first","second","third","fourth"], true);

Your Database class expects an array

$db = new Database($config, array('first', 'second', 'third', 'fourth'), true);

answered Dec 6, 2011 at 14:25

Mike B

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5 Comments

jprofitt Over a year ago

I think he was wanting to make an array

Mike B Over a year ago

@jprofitt You're right. I realized after reading his Database class.

George Reith Over a year ago

Thanks, been doing a lot of actionscript and got the syntax muddled there +1 but it is still not functioning.

Mike B Over a year ago

@George Please don't describe problems with general terms. "not functioning." Is it still white-screening? Is there a new error?

George Reith Over a year ago

@MikeB Sorry it is still white screening - I updated post to match the source as it is currently

Your Common Sense · Accepted Answer · 2011-12-06 14:30:43Z

1

Anyone can see what could be causing it?

Thats most wrong and inefficient way of looking for errors.
you can stare in your code for ages and even ask other people to do it, yet without any success.

Why not to just read the exact error message?
You were on the right track, but gave up.

As Flukey said in the comments, you have to check error log, which by default is the ame as web-server error log.

Watching the actual errors is the only proper way to correct your code.

answered Dec 6, 2011 at 14:30

Your Common Sense

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3 Comments

George Reith Over a year ago

I normally would but in my current environment I am unable to, it may not be right but it's what I have to do right now.

Your Common Sense Over a year ago

Don't tell me you have no server available to run this code with error reporting.

George Reith Over a year ago

Uploaded to another server (doh, duh!) and am working my way through the errors now ta.

goat · Accepted Answer · 2011-12-06 15:22:54Z

1

Tip

If you have a syntax error and are in a situation where the only way you can change the error_reporting/display_errors settings is in the script itself, you can still make it work.

The trick is to make another script that has no syntax errors, and in that script set your config options, and then include the suspected bad script.

<?php
error_reporting(-1); // show all
ini_set('display_errors', 1);
require 'file_with_parse_error.php';

Still, you should generally be able to change these settings in php.ini or webserver config files. And there's should be an error log available to look at in any case.

Then just request the url for that new script in your web browser.

answered Dec 6, 2011 at 15:22

goat

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jrharshath · Accepted Answer · 2011-12-06 14:34:56Z

0

there are other error reporting levels in php.ini - you might want to look into them.

answered Dec 6, 2011 at 14:34

jrharshath

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Catfish · Accepted Answer · 2011-12-06 14:42:06Z

0

Since you're unable to look at error logs, try throwing a bunch of print statements in your code and see what line is killing your script. If it's killing in your database.php script, throw some prints in and there.

<?php
ini_set('display_errors', '1');
require('database.php');
print "Test1";
print("hello");
print "Test2";
$config = new Config("lessons.db","data/");
print "Test3";
$db = new Database($config, array('first', 'second', 'third', 'fourth'), true);
print "Test4";

print_r($db->dumpToArray());
?>

answered Dec 6, 2011 at 14:42

Catfish

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1 Comment

Catfish Over a year ago

Why the downvote? This is a legitimate way to debug if you can't see any errors.

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