Hello friends. I am using the following code to run an operation on a .dat file, which is working fine. The .dat file can be treated as a text file. My main concern is how to improveimproving execution time when you have to run a for loop on 25 Mb of data.
There isare no problemproblems in the above code, except that the .dat file I am using is 25 Mb, so you can understand it will take a long, long time to run the above scriptit. How can I decrease the execution time? Can I use indexing or what? Please help
// echo '<pre>';
//print_r($lat_lon_sunshines);
//echo '<pre>';count($lat_lon_sunshines);
$closest = 500;
for($c=0;$c<count($lat_lon_sunshines);$c++)
{
//echo $c; //echo $c;
$lat2=$lat_lon_sunshines[$c]['lat'];
$lan2=$lat_lon_sunshines[$c]['lan'];
$sunshines=$lat_lon_sunshines[$c]['sunshine'];
//print_r($lat_lon_sunshines$sunshines);die;
//die;
$lat_diff = abs(round((float)($lat1), 4)-$lat2);
if ($lat_diff < $closest)
{
$diff = //echo$lat_diff count+ abs($lat_lon_sunshinesround((float)($lan1), 4)-$lan2);
if($diff < $closest)
{
$closest = 500;$diff;
for($c=0;$c<count($lat_lon_sunshines);$c++) $sunshinesfinal=$sunshines;
}
}
$sunshines='';
}
//echo 'sumit';
print_r($sunshinesfinal);die;
function make_sunshine_dict($file_name)
{
$sunshines_dict = array(); //echo $c; //echo $c;
$lat2=$lat_lon_sunshines[$c]['lat'];
$f = $lan2=$lat_lon_sunshines[$c]['lan'];file_get_contents($file_name);
$sunshines=$lat_lon_sunshines[$c]['sunshine'];
$handle = //print_rfopen($sunshines$file_name, "r");die;;
//die;
$lat_diff = abs(round((float)($lat1), 4)-$lat2);
if/* for($lat_diff < $closest$kkk=0;$kkk<100;$kkk++)
{
$diff = $lat_diff + abs(round((float)($lan1), 4)-$lan2);
$buffer = iffgets($diff < $closest$handle)
{
$closest = $diff;
$sunshinesfinal=$sunshines;
}
}
$sunshines='';;*/
while($buffer = fgets($handle))
{
// print_r($buffer);die;
$tok = strtok($buffer, " \n\t");
$lat=$tok;
$latArray[]=$tok;
//$lat=round(float(values[0]), 4)
//print_r($buffer);
// print_r($tok);
$tok = strtok(" \n\t");
$months = '';
$months = array();
//print_r($tok);die;
for ($k = 0; $tok !== false; $k+=1)
{
if($k==0)
{
$lan=$tok;
$lanArray[]=$tok;
}
if($k!=0)
{
/// echo $tok;
$months[] = $tok ;
"month $k : ".$months[$k]."<br>";
}
$tok = strtok(" \n\t");
}
//echo 'sumit';
print_r($sunshinesfinal);die;
function
make_sunshine_dict /*echo $lat;
echo '<br>';
echo $lang;
echo '<br>';
print_r($file_name$months);*/
//$data=new stdClass();
/*$data->sunshine[]->lat=$lat;
$data->sunshine[]->lan=$lang;*/
$data[$kkk]['lat']=$lat;
$data[$kkk]['lan']=$lan;
//$sunshines=array();
foreach($months as $m=>$sunshine)
{
$sunshines_dict = array();
$f = file_get_contents($file_name);
$handle = fopen($file_name, "r");
/* for($kkk=0;$kkk<100;$kkk++)
{
$buffer = fgets($handle);*/
while($buffer = fgets($handle))
{
// print_r($buffer);die;
$tok = strtok($buffer, " \n\t");
$lat=$tok;
$latArray[]=$tok;
//$lat=round(float(values[0]), 4)
//print_r($buffer);
// print_r($tok);
$tok = strtok(" \n\t");
$months = '';
$months = array();
//print_r($tok);die;
for ($k = 0; $tok !== false; $k+=1)
{
if($k==0)
{
$lan=$tok;
$lanArray[]=$tok;
}
if($k!=0)
{
/// echo $tok;
$months[] = $tok ;
"month $k : ".$months[$k]."<br>";
}
$tok = strtok(" \n\t");
}
/*echo $lat;
echo '<br>';
echo $lang;
echo '<br>';
print_r($months);*/
//$data=new stdClass();
/*$data->sunshine[]->lat=$lat;
$data->sunshine[]->lan=$lang;*/
$data[$kkk]['lat']=$lat;
$data[$kkk]['lan']=$lan;
//$sunshines=array();
foreach($months as $m=>$sunshine)
{
$sunshines=array();
$sumD = 0;
// $iteration= ($m+1)*30+1;
$iteration= 31;
for($n=1;$n<=$iteration;$n++)
{
$J = ($m+1)*$n;
$P = asin(.39795*cos(.2163108 + 2*atan(.9671396*tan(.00860*($J-186)))));
$value=(sin(0.8333*pi/180) + sin($lat*pi/180)*sin($P))/(cos($lat*pi/180)*cos($P));
/* $value ? ($value > 1 and 1) : $value;
$value ? ($value < -1 and -1): $value;*/
$D = 24 - ((24/pi) * acos($value));
$sumD = $sumD + $D;
}
$sunshinesdata=(($sumD/30)*(float)($sunshine)*.01);
//echo '<pre>';
/ $sunshinesdata=(($sumD/print_r30)*($sunshinesfloat);die;($sunshine)*.01);
$data[$kkk]['sunshine'][$m]=$sunshinesdata;
//echo '<pre>';
$sunshines=''; //print_r($sunshines);die;
}
//echo '<pre>';
//print_r($data); $data[$kkk]['sunshine'][$m]=$sunshinesdata;
}
$sunshines='';
//die; }
return//echo $data;'<pre>';
//print_r($data);
}
//die;
return $data;
}
