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Use microseconds to create file name when php image is uploaded

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Release： 2016-07-25 08:52:48
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  3. $m = microtime();
  4. $mtime = explode(' ' ,$m);
  5. $mtime1 = $mtime[1];
  6. $mtime2 = substr($mtime[0 ], 2, 6);
  7. $pic_time = "{$mtime1}{$mtime2}";
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php图片上传时用微秒创建文件名
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