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<?php
function self_concat($str,$n){
$result=null;
while($n--){
$result.=$str;
}
return $result;
}
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list($usec, $sec) = explode(' ', microtime());
return ((float)$usec + (float)$sec);
}
$start=get_microtime();
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echo get_microtime()-$start;
?>
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