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<?php
function getmicrotime(){
list($usec, $sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}
//Àý×Ó
//¿ªÊ¼
$time_start = getmicrotime();
//ÕâÀï·ÅÄãµÄ´úÂë
//½áÊø
$time_end = getmicrotime();
$time = $time_end - $time_start;
echo "Did nothing in $time seconds"; //Êä³öÔËÐÐ×Üʱ¼ä
?>
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