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Bug #23894 (sprintf() decimal specifiers problem)
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$test = sprintf("%04d", $a);
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var_dump($test, bin2hex($test));
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$test = sprintf("% 13u", $a);
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var_dump($test, bin2hex($test));
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string(13) " 4294967284"
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string(26) "20202034323934393637323834"