I m trying to check $GP[sifre] variable, $GP[sifre] must consist of alpha
numeric chars only. here, how I check the variable:

    echo 'true';
    echo 'false';

It works if variable starts with alphabetic chars only.
for example this returns 'ok'
but this does not work: (if variable starts with numeric chars)

second one returns false, couldnt figure out the problem here. any help ?

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