PHP - error_get_last method for warnings?

Question

I am using unlink on my PHP page. In some situations, Permission may be denied for deleting the directory. Instead of having

Warning: unlink(stuff/New folder) [function.unlink]: Permission denied in ... on line 30

show up on the rendered page, is there a way for me to do a "warning_get_last" that will capture the last given warning, so I can output it nicely? Or does error_get_last include these?

I know I can suppress the warnings with @unlink and that I can also check to see if unlink returns false, but I would like to know the error message that goes along with it if it does fail.

Trott · Accepted Answer · 2021-02-11 23:02:36Z

12

Use error_reporting(0) to not show the warning or any errors in the rendered page. It will still show up in your server error logs and you can still use error_get_last() to get the last error.

You can test it out with this:

error_reporting(0);
unlink('some file that does not exist'); // generates a warning
print_r(error_get_last());

EDITED: Please note that error_reporting(0) will affect subsequent code, so you'll want to set it back to the level you want after you're through the code where you want to suppress the error display.

edited Feb 11, 2021 at 23:02

answered Oct 11, 2012 at 4:56

Trott

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3 Comments

Gaʀʀʏ Over a year ago

error_reporting(E_ERROR | E_WARNING) - will cause the error_get_last to display errors or warnings? I can use @ to stop the warnings from showing up. I just need a way to get the message from them.

Gaʀʀʏ Over a year ago

Got the job done! The warnings are showing up with error_get_last. Thanks!

Yousha Aleayoub Over a year ago

error_reporting(0): NEVER turn it off! Use ini_set('display_errors', 0); instead

Robbie · Accepted Answer · 2012-10-11 05:01:13Z

1

You write set your own error handler, enable it just before the call, and revert back to normal afterwards.

Use set-error-handler to turn on the error handler, save to a global variable (that's the simplest - perhaps not most "correct") and show if there was an error. Or user error_get_last() (as suggeted by Trott).

function myErrorHandler($errno, $errstr, $errfile, $errline) {
    global $lastErrorString;
    $lastErrorString = $errstr;
    return false;
}

// Calling function:
global $lastErrorString;
$lastErrorString=false;
$old_error_handler = set_error_handler("myErrorHandler");
unlink($file);
restore_error_handler();
if ($lastErrorString !== false) {
    echo 'Went wrong: ' . $lastErrorString;
}

answered Oct 11, 2012 at 5:01

Robbie

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Comments

Erik Kaplun · Accepted Answer · 2014-08-29 13:16:59Z

0

I fail to see why the following is any worse than the 2 other proposals; in fact I'd say it's better because it's shorter than Robbie's answer and doesn't have a global effect unlike Trott's answer:

$ok = @unlink(...);
if ($ok === FALSE)
    throw new Exception(error_get_last()['message']);

Output when run:

PHP Fatal error:  Uncaught exception 'Exception' with message 'unlink(foobar.txt): No such file or directory' in /Users/erik/code/test.php:5
Stack trace:
#0 {main}
  thrown in /Users/erik/code/test.php on line 5

answered Aug 29, 2014 at 13:16

Erik Kaplun

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