php - Generating unique filename -

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i want generate unique filename uploaded files. should 5 characters in length, , have following characters only: abcdefghijklmnopqrstuvwxyz0123456789. code:

$chars = 'abcdefghijklmnopqrstuvwxyz0123456789'; $length = 5; $filename = ''; for($i = 0; $i < $length; $i++) {     $filename += $chars[mt_rand(0, 36)]; }  echo $filename;

but end 1 or 2 character long integers, never string characters. if run code:

$chars = 'abcdefghijklmnopqrstuvwxyz0123456789'; $length = 5; $filename = ''; for($i = 0; $i < $length; $i++) {     echo $chars[mt_rand(0, 36)]; }

it works fine, , following output: 8iwzf.

what doing wrong here? thanks!

you adding (+=). want concatenate string using dot.

$filename .= $chars[mt_rand(0, 36)];


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