PHP 8.1.30 Released!

Exception::getPrevious

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

Exception::getPreviousReturns previous Throwable

Description

final public Exception::getPrevious(): ?Throwable

Returns previous Throwable (which had been passed as the third parameter of Exception::__construct()).

Parameters

This function has no parameters.

Return Values

Returns the previous Throwable if available or null otherwise.

Examples

Example #1 Exception::getPrevious() example

Looping over, and printing out, exception trace.

<?php
class MyCustomException extends Exception {}

function
doStuff() {
try {
throw new
InvalidArgumentException("You are doing it wrong!", 112);
} catch(
Exception $e) {
throw new
MyCustomException("Something happened", 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());
}
?>

The above example will output something similar to:

/home/bjori/ex.php:8 Something happened (911) [MyCustomException]
/home/bjori/ex.php:6 You are doing it wrong! (112) [InvalidArgumentException]

See Also

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User Contributed Notes 1 note

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11
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;
}
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