$stime = microtime(true); 
$array = array(1,2,3,4,5,6,7); 
$target = 9;//得出的结论 
$array_length = count($array);//数组的长度 
 
function ch_equal($arr, $target, $stime){ 
$start_point = 0; 
$end_point = count($arr)-1; 
$len_arr = count($arr); 
$com_times = $len_arr*($len_arr-1)/2+$len_arr; 
// echo $com_times;die; 
$move_times = 0; 
while ($move_times<=$com_times && $start_point<=$end_point) { 
// echo $start_point."和".$end_point; 
if($arr[$start_point] + $arr[$end_point] == $target){ 
echo $arr[$start_point]." ".$arr[$end_point]; 
handle_time($stime); 
die; 
}; 
if($arr[$start_point] + $arr[$end_point] < $target){ 
// echo $start_point." ".$end_point."
"; 
$start_point += 1; 
$move_times += 1; 
}; 
 
if($arr[$start_point] + $arr[$end_point] > $target){ 
// echo $start_point." ".$end_point."
"; 
$end_point -= 1; 
$move_times += 1; 
}; 
} 
} 
ch_equal($array, $target, $stime); 
 
function handle_time($stime){ 
$etime=microtime(true);//获取程序执行结束的时间 
$total=$etime-$stime; //计算差值 
echo '
该脚本的执行时间为：'.$total."秒"; 
}