How to turn E_PARSE errors into Exception in PHP?

Question

How to turn E_PARSE errors into Exception in PHP?

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#1 by (3 votes)

8

My question is:

PHP has a great feature that allows you to convert errors that can occur in an application to Exceptions . This can be done through the class ErrorException

Example:

set_error_handler(function ($errno, $errstr, $errfile, $errline ) {

    throw new ErrorException($errstr, 0, $errno, $errfile, $errline);

});

try {
   $a = $b;
} catch(\Exception $e){
    echo $e->getMessage(); // Undefined variable: b

}

This "catch error" works perfectly for errors like E_NOTICE , E_WARNING and etc ... However, when a Parse Error ( E_PARSE ) occurs, set_error_handler is not able to capture it.

I was able to (more or less) capture this E_PARSE through the register_register_shutdown_function (it performs a function when php at the end of the script, even if execution is interrupted by E_PARSE ) in combination with the error_get_last .

I would like to know how to do this, so similar occurrence in the capture of errors with the set_error_handler .

How to proceed if you only display the error (and not prior to execution). I'll have to use a ob_start combined with a ob_end_clean within the "catcher" of the error?

Beforehand I already say: To say that there is no way to do this is a lie, because Laravel 4 can perfectly turn E_PARSE into exception too!

Update

Attheuser'srequest@gmsantos,IampostingthetransformationcodefromE_PARSEtoErrorException,whichIthinkistheclosestIwant.

ThisiswhatIwasabletodousingregister_shutdown_function(itwasveryfast,soitdoesnothaveanyobject-oriented:)):

<?phpob_start();echo'Olámundo';//Poressafunção,otry/catchconsegue"pegar" a exceção
set_error_handler(function($errno, $errstr, $errfile, $errline){

    // Se o cara não colocar arroba, o erro é mostrado :)

    if (error_reporting() !== 0) {

        ob_clean(); // limpa o buffer e não imprime "Ólá mundo"

        throw new ErrorException($errstr, 0, $errno, $errfile, $errline);

    }
});

// aqui não dá pra usar try/catch :(

register_shutdown_function(function(){

    // O register_shutdown_function só pode capturar E_PARSERs provenientes de include, e não no mesmo script

    if ($err = error_get_last()) {

        ob_clean(); // limpa o buffer e não imprime "Ólá mundo"

        throw new ErrorException($err['message'], 0, $err['type'], $err['file'], $err['line']);

        /*
            Uncaught exception 'ErrorException' with message 'syntax error, unexpected '.'' 
            in C:\xampp\htdocs\teste\teste.php:4 

            Stack trace: 

            #0 [internal function]: {closure}() 

            #1 {main} thrown in C:\xampp\htdocs\teste\teste.php on line 4
        */
    }

});

// Proprositalmente para gerar uma exception não capturada pelo set_error_handler

$a = @$a;

try {

    $b = $b;

} catch (Exception $e) {

    echo $e->getMessage(); 


    /*
        Se a variável "a" tiver um arroba colocado, essa mensagem é impressa!
        Nesse caso captura a exceção retorna: Undefined Variable: b
    */

}


try {

    include 'teste.php'; 

    /* 
        Esse include gera um E_PARSE, porém só é exibido no catch se for outros tipos de erro, 
        pois o register_shutdown_function é executado só quando o script é encerrado :(
        Não consegui capturar com o "catch"
    */

} catch(\ErrorException $ee) {

    echo $ee->getMessage(); // Esse não imprime nada, como dito acima
}

Just reinforcing what is already written in the example: There is no way to capture E_PARSER in try/catch (at least in this script I did, there's no way)

php try-catch

asked by anonymous 15.01.2015 / 18:15

1 answer

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score 3 · Accepted Answer

Instead of giving throw to ErrorException within the register_shutdown_function callback, you can build a ErrorException and pass it to a handler that will take care of the details.

<?php
function handleException(Exception $e) {
    echo $e->getMessage();
}

function handleError(array $error = null) {
    $err = error_get_last();

    if ($err) {
        $exception =  new ErrorException(
            $err['message'], 
            $err['type'], 
            1,  
            $error['file'], 
            $err['line']
        );
        handleException($exception);
    }
}

register_shutdown_function('handleError');