Problems while using a callback function in PHP

Question

I am having this problem When using callback functions

Class My_Class {

     public function my_function() {

            $pad = function($value) {
            return str_pad($value, 2, '0', STR_PAD_LEFT);
            };

            function pad_function($value) {
                 return str_pad($value, 2, '0', STR_PAD_LEFT);
            }

            array_map($pad, range(0,100)); //This fails with an exception "Invalid opcode 153/1/8."
            array_map("pad_function", range(0,100)); //This works ok
        }



}

I am using PHP version 5.3.3-7.

Any ideas of why this is happening?

Thanks in advance!

The "invalid opcode" error looks like a bug in PHP. PHP 5.3.3 is rather outdated; try upgrading to 5.3.16 and see if that fixes it. — user149341
– user149341, Commented Aug 23, 2012 at 4:13
I just fixed the syntax error, i tried to rush it too much. Any ideas? — Juan Antonio Gomez Moriano
– Juan Antonio Gomez Moriano, Commented Aug 23, 2012 at 4:41

Juan Antonio Gomez Moriano · Accepted Answer · 2012-08-23 06:27:43Z

1

Finally the problem was with eaccelerator.

Version 1.0-dev of eaccelerator carashes when executing the code. Version 0.9.6.1 of eaccelerator does not crash with the code.

answered Aug 23, 2012 at 6:27

Juan Antonio Gomez Moriano

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Comments

moonwave99 · Accepted Answer · 2012-08-23 02:47:05Z

0

Typos apart, $pad is never defined.

Then array_map won't call your $my_pad_function lambda function, because you passed the my_pad_function string as first parameter, telling PHP to look for a function named my_pad_function: that's different from calling a lambda stored in $my_pad_function.

Anyway I advice you not to call everything "my_function", "myPrettyFunction", "myPointlessNameVar": give meaningful names even in playground code, your goal will be clearer.

One last thing:

lambdas : PHP = lipstick : pig

answered Aug 23, 2012 at 2:47

moonwave99

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1 Comment

Juan Antonio Gomez Moriano Over a year ago

Thanks for the advices, the reason for calling them My_Whatever is because i didn't want to just copy & paste my own code (as it contains more vars and so on), that is also the reason why there were so many errors :).

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