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15 years ago
At work I have some code with errors that uncatched are the causes of integrity loss (people calling web services with file_get_contents that fails silently and afterwards insert garbage in the database). 



here is the solution I found to transform a specific set of errors into exception and afterwards be able to selectively act (with the error code) regarding categories :  



<?php

ini_set('error_reporting',E_ALL^E_NOTICE);



## first 10 bits reserved for the initial error number

define('EMASK',(~0)<<10);

define('ECODEMASK',~EMASK);

## categories 

define('IOERROR', 1<<10);

define('EMPTYPARMS', 1<<11);

define('FAILURE', 1<<12);

## string error patterns => code 



$catch_me=array(

    "/^(file_get_contents)\((.*)\).*failed to open stream: (.*)/ " => 

        array ( 'mesg' => "IO::Failed to open stream with",

                'code' => IOERROR | FAILURE

        ),

    "/^fopen\(.*\): Filename cannot be empty/" => 

        array( 'msg' => "Parameters::empty",

                'code' => EMPTYPARMS

        )

    );

function error_2_exception($errno, $errstr, $errfile, $errline,$context) {

    global $catch_me;

    foreach ($catch_me as $regexp  => $res) {

        if(preg_match($regexp,$errstr,$match)){

            throw new Exception($res['mesg'],$res['code']|( $errno & EMASK ) );

        }

    }

    /* switch back to PHP internal error handler  */

    return false;

}

## => want to catch this one

$f=file_get_contents("mlsdkfm");

## dont want to break existing wrong behaviour yet (so not caught)

$f=file_get_contents('');

## magic

set_error_handler("error_2_exception");

## behaviour remains the same

$f=file_get_contents('');

try { 

## web services that dont work now raise an exception \o/

$f=file_get_contents("mlsdkfm");

} catch(Exception $e) {

## and I can group my exception by category

    echo ( $e->getCode() & FAILURE )  ? "\nEPIC FAIL\n" : "\nbegnine";

}



?>
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