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function get_randomString($count=8, $rm_similar = false){
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//create list of characters
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$chars = array_flip(array_merge(range(0, 9), range('A', 'Z')));
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// remove similar looking characters that might cause confusion
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if ($rm_similar) {
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unset($chars[0], $chars[1], $chars[2], $chars[5], $chars[8], $chars['B'],
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$chars['I'], $chars['O'], $chars['Q'], $chars['S'], $chars['U'], $chars['V'], $chars['Z']);
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}
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// generate the string of random text
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for( $i = 0, $text = ''; $i < $count; $i++ ) {
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$text .= array_rand($chars);
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}
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return $text;
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}