<?php
function renderImage($imageResource, $imageType)
{
  switch ($imageType) {
  case 'jpg':
  case 'jpeg':
header('Content-type: image/jpeg');
imagejpeg($imageResource);
    break;
  case 'png':
header('Content-type: image/png');
imagepng($imageResource);
    break;
  default:
    throw new DomainException('Unknown image type: ' . $imageType);
    break;
  }
imagedestroy($imageResource);
}
?>

down

ja2016 at wir dot pl ¶

8 years ago

I think this kind of exception is perfect to throw when expected the  type of parameter, value etc. is good, but its value is out of domain. Look at RangeException:
>>Exception thrown to indicate range errors during program execution. Normally this means there was an arithmetic error other than under/overflow. This is the runtime version of DomainException.<<
So, this kind of exception is designed for logic error

When datatype is wrong, the better way is throwing InvalidArgumentException. 

<?php
// Here, use InvalidArgumentException
function media($x) {
    switch ($x) {
        case image:
            return 'PNG';
        break;
        case video:
            return 'MP4';
        break;
        default:
            throw new InvalidArgumentException ("Invalid media type!");
    }
}?>
This is completly diffirent situation than this:
<?php
// Here, use DomainException
$object = new Library ();
try {
$object->allocate($x);
} catch (toFewMin $e) {
    throw new DomainException ("Minimal value to allocate is too high").
}
?>
The simillar situation, but problem occurs during runtime:
<?php
class library {
    function allocate($x) {
        if ($x<1000)
            throw new RangeException ("Value is too low!")
    }
}
?>
Summary: DomainException corresponds to RangeException and we should use them in simillar situations.  But first exception is designed to use when we are sure the problem is with our project, third-part elements etc. (simply: logical error), the second way is designed to use when we are sure the problem is with input data or environment (simply: runtime error).

down

chmielewski dot thomas at gmail dot com ¶

10 years ago

<?php

function divide($divident, $divisor) {
    if(!is_numeric($divident) || !is_numeric($divisor)) {
        throw new InvalidArgumentException("Function accepts only numeric values");
    }
    if($divisor == 0) {
        throw new DomainException("Divisor must not be zero");
    }
    return $divident / $divisor;
}

down

Cruiser ¶

7 years ago

Quote: "In data management and database analysis, a data domain refers to all the values which a data element may contain."

Source: https://en.wikipedia.org/wiki/Data_domain

This exception has confused me a bit, DataDomainException, or DataTypeException may have been more descriptive.

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PHP官方手册 - 互联网笔记

The DomainException class

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