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Exception::getPrevious

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

Exception::getPreviousRetorna o Throwable anterior

Descrição

final public Exception::getPrevious(): ?Throwable

Retorna o Throwable anterior (o terceiro valor passado no construtor Exception::__construct()).

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Retorna a Throwable anterior se disponível, ou senão null.

Exemplos

Exemplo #1 Exception::getPrevious() example

Iterando e imprimindo a pilha de erro.

<?php
class MyCustomException extends Exception {}

function
doStuff() {
try {
throw new
InvalidArgumentException("Primeiro erro lançado.", 112);
} catch(
Exception $e) {
throw new
MyCustomException("Segundo erro lançado.", 911, $e);
}
}


try {
doStuff();
} catch(
Exception $e) {
do {
printf("%s:%d %s (%d) [%s]\n", $e->getFile(), $e->getLine(), $e->getMessage(), $e->getCode(), get_class($e));
} while(
$e = $e->getPrevious());
}
?>

O exemplo acima produzirá algo semelhante a:

/home/bjori/ex.php:8 Segundo erro lançado. (911) [MyCustomException]
/home/bjori/ex.php:6 Primeiro erro lançado. (112) [InvalidArgumentException]

Veja Também

add a note

User Contributed Notes 2 notes

up
9
harry at upmind dot com
5 years ago
/**
* Gets sequential array of all previously-chained errors
*
* @param Throwable $error
*
* @return Throwable[]
*/
function getChain(Throwable $error) : array
{
$chain = [];

do {
$chain[] = $error;
} while ($error = $error->getPrevious());

return $chain;
}
up
-9
Anonymous
12 years ago
May be I am late (5.2 is not supported). But if you want use the functionality of "previous Exception" in PHP < 5.3 or write compatible code, you can use next way as below.

<?php
abstract class App_Exception_PreviousNativeAbstract extends Exception {
public static
$printPrevious = true;

public function
__toString() {
$result = array();
$result[] = sprintf("Exception '%s' with message '(%s) %s' in %s:%d", get_class($this), $this->code, $this->message, $this->file, $this->line);
$result[] = '---[Stack trace]:';
$result[] = $this->getTraceAsString();

if (
self::$printPrevious) {
$previous = $this->getPrevious();
if (
$previous) {
do {
$result[] = '---[Previous exception]:';
$result[] = sprintf("Exception '%s' with message '(%s) %s' in %s:%d", get_class($previous), $previous->getCode(), $previous->getMessage(), $previous->getFile(), $previous->getLine());
$result[] = '---[Stack trace]:';
$result[] = $previous->getTraceAsString();
} while(
method_exists($previous, 'getPrevious') && ($previous = $previous->getPrevious()));
}
}

return
implode("\r\n", $result);
}
}

abstract class
App_Exception_PreviousLegacyAbstract extends App_Exception_PreviousNativeAbstract {
protected
$previous;

public function
__construct($message, $code = 0, Exception $previous = null) {
$this->previous = $previous;

parent::__construct($message, $code);
}

public function
getPrevious() {
return
$this->previous;
}
}

if (
version_compare(PHP_VERSION, '5.3.0', '>=')) {
abstract class
App_Exception_PreviousAbstract extends App_Exception_PreviousNativeAbstract {}
}
else {
abstract class
App_Exception_PreviousAbstract extends App_Exception_PreviousLegacyAbstract {}
}

class
App_Exception extends App_Exception_PreviousAbstract {
public function
__construct($message, $code = 0, Exception $previous = null) {
parent::__construct($message, 0, $previous);
}
}

// Example:
try {
// ...
throw new Exception('Exception mesage');
// ...
} catch (Exception $e) {
throw new
App_Exception('App exception mesage', 0, $e);
}
?>
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