PHP preg_replace_callback() Compilation failed: missing )

Question

ok i do have this small helper function

public static function toJSON($arr){
        $json = json_encode($arr);
        return preg_replace_callback('/(?<=:)"function((?:(?!}").)*}"/',
                                    function($string){
                                        return str_replace(array('\"','/','"','n','t'),array('"','/','"','',''),substr($string[0],1,-1));
                                     },$json);
    }

now what i did there was i created a anonymous function for the callback of preg_replace_callback() function, i checked 3 times already if i missed a single parentheses but my IDE(zend studio) seems not to show any unclosed parentheses.

my error is this

preg_replace_callback() Compilation failed: missing ) at offset 30 (X:\xampp\htdocs\aya\protected\xxx\xxxArray.php:180

where i got wrong?

NOTE: the purpose of this small helper function is to let me create anonymous function inside my json output. if you can recommend me a much better script it would be a big help for me..

get yourself a good syntax highlighting editor with brace matching feature. try notepad2. — You Qi
– You Qi, Commented Jul 19, 2012 at 2:49

complex857 · Accepted Answer · 2013-11-09 21:43:23Z

1

I'm pretty sure the original author meant to do:

'/(?<=:)"function((?:(?!}").)*})"/'
                               ^

If you would want to capture the function body (with the arguments) for the replacing later, however the replace function uses the 0 index (the whole match) later so you can remove the first ( too:

'/(?<=:)"function(?:(?!}").)*}"/'
                 ^
                 +-- a "(" deleted

This will work too (eats a little less memory as well).

edited Nov 9, 2013 at 21:43

answered Nov 9, 2013 at 21:33

complex857

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Comments

Robbie · Accepted Answer · 2012-07-19 02:48:13Z

1

There is an unclosed parenthesis in

'/(?<=:)"function((?:(?!}").)*}"/'

The editor won't spot it as it won't validate content in strings.

answered Jul 19, 2012 at 2:48

Robbie

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