PHP image upload uses microseconds as file name, _PHP tutorial

PHP uses microseconds for image upload as file name,

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

http://www.bkjia.com/PHPjc/867002.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/867002.htmlTechArticlephp uses microseconds for file names when uploading images, $m = microtime (); $mtime = explode(' ' ,$m); $mtime1 = $mtime[1]; $mtime2 = substr($mtime[0], 2, 6); $pic_time = "{$mtime1}{$mtime2}";...