Php error handling

[Jaan]

When creating scripts and web applications, error handling is an important part. If your code lacks error checking code, your program may look very unprofessional and you may be open to security risks.

That's right, but how to remove those ugly error messages. Well it's simple.

Basic:

PHP Code:

<?php
$myFile = fopen("myfile.txt", "r");
?>

If your file don't exist you will receive error message like this:

Warning: fopen(myfile.txt) [function.fopen]: failed to open stream: No such file or directory in /home/(something)/public_html/error.php on line 2

It's really simple to remove it. You can use this code:

PHP Code:

<?php
$myFile = "myfile.php";
if(!file_exists($file)){
die("Your file don't exist!");
}else{
$open = fopen($myFile, "r");
}
?>

Custom error handler:

Syntax

error_function(error_level,error_message, error_file,error_line,error_context)

How to set an error handler? It's simple:

PHP Code:

set_error_handler("YourFunctionInHere"); 


Example:

PHP Code:

<?php
function mycustomerror($errornumber, $errormessage, $errorfile, $errorrow){ 
echo "<b>Error:</b> [$errornumber] $errormessage $errorfile $errorrow";
}
set_error_handler("mycustomerror");
?>

Okay now your error handler is set, let's try it.

PHP Code:

<?php
function mycustomerror($errornumber, $errormessage, $errorfile, $errorrow){ 
echo "<b>Error:</b> [$errornumber] $errormessage $errorfile $errorrow";
}
set_error_handler("mycustomerror");
echo $myErrorTest;
?>

You will receive this error:

Error: [8]Undefined variable: myErrorTest /home/(something)/public_html/error.php 6

I hope it helped..
Regards Jaan

[John]

ahhh fopen a php file...fun times

[acccapulco]

I am using very similar code:

PHP Code:

error_reporting (E_ALL);
function on_error ($num, $str, $file, $line) {
        global $errors_buffer;
        $errors_buffer[] = array('num'=>$num, 'str'=>$str, 'file'=>$file, 'line'=>$line);
}
set_error_handler("on_error"); 


In footer of my application I send e-mail containing $errors_buffer to myself. Users of my website doesn't see any errors and I have a message when something goes wrong.

[Xav]

I'll just stick with die().