php 图片上传 使用微秒做文件名，_PHP教程

php 图片上传 使用微秒做文件名，

$m = microtime ();
$mtime = explode(' ' ,$m);
$mtime1 = $mtime[1];
$mtime2 = substr($mtime[0], 2, 6);
$pic_time = "{$mtime1}{$mtime2}";

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