Error Handling

Posted on 2006-11-22
Last Modified: 2008-03-06
In PHP5 if you return false out of the function referenced by set_error_handler the default PHP error handler takes over and handles everything. Is there a way to do this in PHP4? Or perhaps anyone has the default error handler code written in PHP?
Question by:thepadders
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LVL 11

Expert Comment

ID: 18001131
Take a read here.

5.0.0      The error_types parameter was introduced.
4.3.0      Instead of a function name, an array containing an object reference and a method name can also be supplied as the error_handler.
4.0.2      Three optional parameters for the error_handler user function was introduced. These are the filename, the line number, and the context.

The above link contains also an example to handle errors with the set_error_handler.

Hope it helps.

Author Comment

ID: 18001158
Yes, I understand all that but it dosen't really help answer my question unfortunatly.
LVL 11

Expert Comment

ID: 18001214
I don't understand your question. My bad english, sorry. Some one will answer.
LVL 48

Expert Comment

ID: 18001355
No if you use a error-handler in php4 the returnvalue of your function is not evaluated by php4 and thus you need to take care of it in your error-handler (e.g. print out the error-message)
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LVL 13

Expert Comment

ID: 18002243
The whole point of set_error_handler is to offer a way for you to handle errors why would you set a return value?

As an Example :

function errMsg ($err_type, $err_msg, $err_file, $err_line) {

      $errortype = array (
                1   =>  "Error",
                2   =>  "Warning",
                4   =>  "Parsing Error",
                8   =>  "Notice",
                16  =>  "Core Error",
                32  =>  "Core Warning",
                64  =>  "Compile Error",
                128 =>  "Compile Warning",
                256 =>  "User Error",
                512 =>  "User Warning",
                1024=>  "User Notice",
                2048=>  "Strict Error"

        if ($err_type <= error_reporting()) {

              // We Need to Handle this Error
              echo      ("      A $errortype[$err_type] has occured in <b>$err_file</b> at line <b>$err_line</b> <br />
              // Log Error
            $error_text            =            "ERROR DATE TIME : ".date("d/m/Y g:m A")."\n";
            $error_text            .=            "ERROR TYPE WAS : $error_name\n";
            $error_text            .=            "ERROR OCCURED AT : $err_file - $err_line\n";
            $error_text            .=            "ERROR WAS : $err_msg\n\n";


set_error_handler("errMsg");      // Set Error Handler

LVL 48

Expert Comment

ID: 18002409
You set an return value, so the default php-error-handler can be used (e.g. you only want to catch errors from cetrain files by your own) As php has some more options to handle errors (e.g. write to webserver-log) this can be a very usefull option.

Author Comment

ID: 18005054
Yes, hernst42 understands the reason; I guess there is no easy work around to do this, will just have to wrap the whole thing in a check for PHP5.
LVL 48

Accepted Solution

hernst42 earned 500 total points
ID: 18006594
We also use this method to cope and log certain application errors. before we moved completly to php we hat the following code which worked both with php4 and php5:

if (substr(phpversion(),0,1) < 5) {
    // emulate error-output in php4
    echo '<b> ' . $errortype[$errno] . "</b>: $errmsg in <b>$filename</b> on line <b>$linenum</b><br/>\n";

// If debugging is done also render the errors into the page (php5) thing
return false;

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