Dear listmates,

Please, let me start with an illustration to cut it short:
    input => output
A: 3313 => 3313;  
B: 3313 => 3?13;  
-------------------------
3 -> a variable-length character;
1 -> a one byte ascii character;
? -> a one byte ascii question mark (literaly)

That means when i output a constant (a string of variable-length characters) 
with an echo() function i normally get everything correct in a browser window. 
That makes a case A

Sometimes (probability 1/(2-20)) i get a question mark instead of a particular 
variable-length character when the other variable-length characters are 
displayed correctly within the same page. This is case B

Can someone please tell me what could be the cause of that.
Personally i can imagine
 anything from a faulty hardware from the memory down the nic to a software 
error anywhere but the drivers. And i would rather like to narrow the scope.

Thanks
Nash

More details for an instant:
- Only characters read from a utf-8 encoded file with a function 
file_get_contents() seem to be displayed correctly at all times;
- Characters that are read by the php.exe (please excuse me here) do fail once 
in a while
- Interesting observation is that in case of a failure 
'mbstring.internal_encoding' constant output by the phpinfo() changes from 
undefined to ISO
- Even more interesting observation is that changing this 
'mbstring.internal_encoding' and setting it to UTF-8 locally does not affect 
things to the better.

A glimpse of the php settings:
mb_internal_encoding("UTF-8");
ini_set('mbstring.internal_encoding',
 'UTF-8');
ini_set('iconv.input_encoding', 'UTF-8');
ini_set('iconv.internal_encoding', 'UTF-8');
ini_set('iconv.output_encoding', 'UTF-8');
ini_set('default_charset', 'UTF-8');
ini_set('detect_unicode', 'Off');
ini_set('display_startup_errors', 'On');
ini_set('output_buffering', 'On');
ini_set('zlib.output_compression', 'Off');




      

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