try catch

[sneskid]

in Javascript one can easily do the following:

<script type="text/javascript">
try {
eval('will cause error');
}
catch(e) {
alert(e);
}
</script>

in PHP the try catch system is only for errors thrown by your code, seems like I can't catch errors thrown by PHP.
<?php
try {
eval('will cause error');
}
catch (Exception $e) {
  echo 'Caught exception: ',  $e->getMessage(), "\n";
}
?>

Sadly that wont work, really limits the whole try/catch concept.

Any other ways I can achieve a Javascript like functionality?

[konnwat]

[code]<?php
try {
eval('will cause error');
}
catch (Exception $e) {
  echo 'Caught exception: '.$e->getMessage()."\n";
}
?>[/code]

try that ^^

[.josh]

please note that the [url=http://us3.php.net/manual/en/language.exceptions.php]try..catch[/url] is for php5. It won't work in php4.

You might want to get creative with the [url=http://www.php.net/die]die[/url] statement, like

[code]
$sql = "select something from table";
$blah = mysql_query($sql) or die(mysql_error());
// will run the query. if it returns a fail (false, the error that mysql encountered will be displayed
[/code]

[sneskid]

[quote author=konnwat link=topic=124065.msg513580#msg513580 date=1169764776]
[code]<?php
try {
eval('will cause error');
}
catch (Exception $e) {
  echo 'Caught exception: '.$e->getMessage()."\n";
}
?>[/code]

try that ^^
[/quote]

yea, that doesn't work. it won't execute anything inside the catch block, but still raises the parse error, i want to catch that error.

im using php 5.1.4

[trq]

You cant catch parse errors. In fact you can't catch php generated errors.

The best you could do would be.....

[code]
<?php
try {
  if (!@eval('will cause error')) {
    throw new exception('unknown error');
  }
} catch (Exception $e) {
  echo 'Caught exception: '.$e->getMessage()."\n";
}
?>
[/code]

Which I'm sure is not really what you want to hear. Ive always thought the same myself, not being able to catch php's exceptions.... then whats the point?

[sneskid]

[quote author=thorpe link=topic=124065.msg513664#msg513664 date=1169773177]
You cant catch parse errors. In fact you can't catch php generated errors.

The best you could do would be.....

[code]
<?php
try {
  if (!@eval('will cause error')) {
    throw new exception('unknown error');
  }
} catch (Exception $e) {
  echo 'Caught exception: '.$e->getMessage()."\n";
}
?>
[/code]

Which I'm sure is not really what you want to hear. Ive always thought the same myself, not being able to catch php's exceptions.... then whats the point?
[/quote]

Thanks Thorpe
Yea the PHP try/catch system is weak