[RESOLVED] Handling Error

[joboy]

I am new to PHP and locating error or debugging your codes is very time consuming, is there anyone who could share technique? so I could display customized messages instead of just looking at white blank browser when PHP error occured.

[NogDog]

To ensure that all run-time errors are reported, you may want to start your scripts with the following:

<?php
ini_set("display_errors", 1);
error_reporting(E_ALL);
// rest of script....
?>

Also, never assume anything will work-- check all return values for failures. For instance, don't just do...

$db = mysql_select_db('database');

...but instead do something like...

$db = mysql_select_db('database');
if($db == FALSE)
{
   die("DB select failed: " . mysql_error());
}
//
// or you could just do:
$db = mysql_select_db('database') or die("DB select failed: " . mysql_error());

[schwim]

Also, check out the Debugging tips thread in the echo lounge. I found lots of nifty tips in there.

thanks,
json

[pcthug]

Also remove any error control operators ([font=COurier New]@[/font]) from your source as they will silence any error output trigged by the relevant function.

[joboy]

thanks for all ur replies guys...i'll just be giving feedback as soon as i wil finish tried to functons or commands.

[joboy]

i had tried all ur suggestions... plus i made changes on php.ini, specifically on display_error. i changed the value from "off" to "on". the result was fantastic, even an omission of ";" in this sample code <?php $name = "joboy" ?> produces a parse error.

[acey]

i'll use this too thanks

[MarkR]

On your production site you should show a standard message when an error occurs.

In your dev site, feel free to spit out the error with stack trace etc. I have written an error handler which throws an exception on all errors, warnings, notices etc. This has proved very useful and looks something like this:

/*
 * Error handling:
 * Convert errors to exceptions.
 * Make warnings fatal, make errors fatal. We don't want to continue.
 */

// error handler function
function ErrorToException($errno, $errstr, $errfile, $errline)
{
	// Ensure that errors are suppressed properly.
	$reporting_level = error_reporting();
	if (($errno & $reporting_level) == 0) {
		return;
	}
	// Otherwise, cause a fatal error and spit out relevant info.
	$error_type_names = 
		array(E_USER_ERROR => "User Error", 
			E_USER_WARNING => "User Warning",
			E_USER_NOTICE => "User Notice",
			E_ERROR => "Error",
			E_WARNING => "Warning",
			E_NOTICE => "Notice");
	if (isset($error_type_names[$errno])) {
		$errname = $error_type_names[$errno];
	} else {
		$errname = "Unknown error $errno";
	}
	$exception_string = "Unexpected " . $errname . ":" . $errstr;
	throw new Exception($exception_string);
}
set_error_handler ("ErrorToException");

Of course this assumes you're using PHP5. But any older version is decrepid and should not be used for new work.

Mark

[Installer]

...<?php $name = "joboy" ?> produces a parse error.

What level do you have your error reporting at? Mine is set at all with strict, and I get no message. It's strange you get a parse error, since the line doesn't contain one.

[joboy]

Installer wrote:

What level do you have your error reporting at? Mine is set at all with strict, and I get no message. It's strange you get a parse error, since the line doesn't contain one.

set the level to error_reporting = E_ALL.
<?php
scripts here..
$name = "joboy"
scripts here..
?>
this is what reall the codes look like.. parse error will displayed because it lacks terminatior ";".

[joboy]

sooner, i will be usign these codes.

[joboy]

MarkR wrote:

On your production site you should show a standard message when an error occurs.

In your dev site, feel free to spit out the error with stack trace etc. I have written an error handler which throws an exception on all errors, warnings, notices etc. This has proved very useful and looks something like this:

/*
 * Error handling:
 * Convert errors to exceptions.
 * Make warnings fatal, make errors fatal. We don't want to continue.
 */

// error handler function
function ErrorToException($errno, $errstr, $errfile, $errline)
{
	// Ensure that errors are suppressed properly.
	$reporting_level = error_reporting();
	if (($errno & $reporting_level) == 0) {
		return;
	}
	// Otherwise, cause a fatal error and spit out relevant info.
	$error_type_names = 
		array(E_USER_ERROR => "User Error", 
			E_USER_WARNING => "User Warning",
			E_USER_NOTICE => "User Notice",
			E_ERROR => "Error",
			E_WARNING => "Warning",
			E_NOTICE => "Notice");
	if (isset($error_type_names[$errno])) {
		$errname = $error_type_names[$errno];
	} else {
		$errname = "Unknown error $errno";
	}
	$exception_string = "Unexpected " . $errname . ":" . $errstr;
	throw new Exception($exception_string);
}
set_error_handler ("ErrorToException");

Of course this assumes you're using PHP5. But any older version is decrepid and should not be used for new work.

Mark

sooner, i will be using these codes..