how to read a php error message into a string variable

Question

I'm doing a small program which needs to read error meesage when errors occur.

For example, one operation triggered an error, and php log recorded it as:

PHP Fatal error:  Smarty error: [in /mnt/n2my_web/templates/ja_JP/mail/reservation_create.t.txt line 16]: syntax error: mismatched tag {/if}. (Smarty_Compiler.class.php, line 2338) in /mnt/n2my_web/lib/Smarty/Smarty.class.php on line 1092

I know by setting ini_set('display_errors', '1'); the error message can be printed. But I need to read it, in order to format it.

By which means can I achieve this? Any answer is appreciated. :)

Do you want to know about errors in general or the specific case of fatal errors, which are a whole different issue and cannot be treated like normal errors? — Mike Brant
– Mike Brant, Commented Dec 13, 2013 at 1:24
Hi Mike, actually errors in this project will always be smarty error, that is to say all the errors should be php fatal errors. — Sarotti
– Sarotti, Commented Dec 13, 2013 at 1:26

egig · Accepted Answer · 2013-12-13 01:26:37Z

2

Use this: http://www.php.net/manual/en/function.error-get-last.php , to handling error, I recommend you to just use custom exception and error handler

http://www.php.net/manual/en/function.set-exception-handler.php.

http://www.php.net/manual/en/function.set-error-handler.php

answered Dec 13, 2013 at 1:26

egig

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2 Comments

Sammitch Over a year ago

Worth noting that error_get_last() won't be any good for anything more severe than an E_WARN since execution halts at that point.

Sarotti Over a year ago

Hi egig, thanks for your recommendation. As for this question, as Sammitch said terminating point should be considered. I think it's my express causes confusions, thank you.

Mike Brant · Accepted Answer · 2013-12-13 01:37:26Z

0

Really the only way to can access any error information around a fatal error is to use register_shutdown_function() to try to catch these errors and work with them before the script is terminated. This is not 100% reliable.

register_shutdown_function(function() {
   $last_error = error_get_last();
   if(!is_null($last_error) && $last_error['type'] === E_ERROR) {
       /*
       Do something with $last_error info.
       $last_error will contain array with keys as follows:
       ['type']['message']['file']['line']
       */
   }
});

answered Dec 13, 2013 at 1:37

Mike Brant

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2 Comments

Sarotti Over a year ago

Hi Mike, my script terminated at calling a smarty function. So I placed register_shutdown_function() just 1 line before calling smarty function it seems doesn't work. Then I put it at the beginning of my own function, also doesn't work. Where to register should be a question?

Sarotti Over a year ago

Mike, your answer is right, but I guess unless ini_set('display_errors', '1'); is set, or error message will not be returned. I'm not sure, in my practice if the display_errors is not set I cannot get the message from error_get_last();

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