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list($usec, $sec) = explode(" ",microtime()); 
return ((float)$usec + (float)$sec); 

//Àý×Ó 
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$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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