How to make dynamic array from static array - php

Question

I have trouble with my static array, i need to update with dynamic array can someone help me ? because will be so hard if i have alot data and i must create 1 by 1.
$kriteria = [C1,C2,C3,C4,C5,C6];
$alternatif = [ALT1,ALT2,ALT,ALT4,ALT5,ALT6,ALT7];
$nEntropy = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
$nEntropy[$i] = (((-1)/log(7)) *(
($probabilitas[0][0]*log($probabilitas[0][0]))+
($probabilitas[1][0]*log($probabilitas[1][0]))+
($probabilitas[2][0]*log($probabilitas[2][0]))+
($probabilitas[3][0]*log($probabilitas[3][0]))+
($probabilitas[4][0]*log($probabilitas[4][0]))+
($probabilitas[5][0]*log($probabilitas[5][0]))+
($probabilitas[6][0]*log($probabilitas[6][0]))
));
}
}
$nEntropy1 = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
$nEntropy1[$i] = (((-1)/log(7)) *(
($probabilitas[0][1]*log($probabilitas[0][1]))+
($probabilitas[1][1]*log($probabilitas[1][1]))+
($probabilitas[2][1]*log($probabilitas[2][1]))+
($probabilitas[3][1]*log($probabilitas[3][1]))+
($probabilitas[4][1]*log($probabilitas[4][1]))+
($probabilitas[5][1]*log($probabilitas[5][1]))+
($probabilitas[6][1]*log($probabilitas[6][1]))
));
}
}
$nEntropy2 = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
$nEntropy2[$i] = (((-1)/log(7)) *(
($probabilitas[0][2]*log($probabilitas[0][2]))+
($probabilitas[1][2]*log($probabilitas[1][2]))+
($probabilitas[2][2]*log($probabilitas[2][2]))+
($probabilitas[3][2]*log($probabilitas[3][2]))+
($probabilitas[4][2]*log($probabilitas[4][2]))+
($probabilitas[5][2]*log($probabilitas[5][2]))+
($probabilitas[6][2]*log($probabilitas[6][2]))
));
}
}
$nEntropy3 = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
$nEntropy3[$i] = (((-1)/log(7)) *(
($probabilitas[0][3]*log($probabilitas[0][3]))+
($probabilitas[1][3]*log($probabilitas[1][3]))+
($probabilitas[2][3]*log($probabilitas[2][3]))+
($probabilitas[3][3]*log($probabilitas[3][3]))+
($probabilitas[4][3]*log($probabilitas[4][3]))+
($probabilitas[5][3]*log($probabilitas[5][3]))+
($probabilitas[6][3]*log($probabilitas[6][3]))
));
}
}
$nEntropyy4 = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
$nEntropy4[$i] = (((-1)/log(7)) *(
($probabilitas[0][4]*log($probabilitas[0][4]))+
($probabilitas[1][4]*log($probabilitas[1][4]))+
($probabilitas[2][4]*log($probabilitas[2][4]))+
($probabilitas[3][4]*log($probabilitas[3][4]))+
($probabilitas[4][4]*log($probabilitas[4][4]))+
($probabilitas[5][4]*log($probabilitas[5][4]))+
($probabilitas[6][4]*log($probabilitas[6][4]))
));
}
}
$nEntropy5 = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
$nEntropy5[$i] = (((-1)/log(7)) *(
($probabilitas[0][5]*log($probabilitas[0][5]))+
($probabilitas[1][5]*log($probabilitas[1][5]))+
($probabilitas[2][5]*log($probabilitas[2][5]))+
($probabilitas[3][5]*log($probabilitas[3][5]))+
($probabilitas[4][5]*log($probabilitas[4][5]))+
($probabilitas[5][5]*log($probabilitas[5][5]))+
($probabilitas[6][5]*log($probabilitas[6][5]))
));
}
}
showb($nEntropy);
showb($nEntropy1);
showb($nEntropy2);
showb($nEntropy3);
showb($nEntropy4);
showb($nEntropy5);
this image for my results
as you can see my code really static and so hard if i have alot data
and also i need my results likes this
EDIT
the answers from Vörös Amadea are correct, but there are still some that are lacking, my second question regarding the results is still in large numbers. is there a way to display it only once?
as u can see on my image before, i need to remove duplicate data so only 1 for each is who will displayed and store it into array.
I have modified a little code from Vörös Amadea because if I don't modify it, I get an error "Undefined variable: probability"
this is the code that I have modified.
for($x=0;$x<1;$x++){
$nth = $x;
$entz = array();
for ($i=0;$i<count($kriteria);$i++)
{
for ($j=0;$j<count($alternatif);$j++)
{
${"entz$nth"}[$i] = (((-1)/log(7)) *(
($probabilitas[0][$nth]*log($probabilitas[0][$nth]))+
($probabilitas[1][$nth]*log($probabilitas[1][$nth]))+
($probabilitas[2][$nth]*log($probabilitas[2][$nth]))+
($probabilitas[3][$nth]*log($probabilitas[3][$nth]))+
($probabilitas[4][$nth]*log($probabilitas[4][$nth]))+
($probabilitas[5][$nth]*log($probabilitas[5][$nth]))+
($probabilitas[6][$nth]*log($probabilitas[6][$nth]))
));
}
}
}
showb(${"entz$nth"});

Answer 1

You can generate variable names in for loops like this.
Just change the value of $how_many_i_want.
$how_many_i_want = 3;
for($x=0;$x<$how_many_i_want;$x++){
generate_entropy($x);
}
function generate_entropy($nth){
$kriteria = ['C1','C2','C3','C4','C5','C6'];
$alternatif = ['ALT1','ALT2','ALT','ALT4','ALT5','ALT6','ALT7'];
${"nEntropy$nth"} = array();
for ($i=0;$i<count($kriteria);$i++){
for ($j=0;$j<count($alternatif);$j++){
${"nEntropy$nth"}[$i] = (((-1)/log(7)) *(
($probabilitas[0][$nth]*log($probabilitas[0][$nth]))+
($probabilitas[1][$nth]*log($probabilitas[1][$nth]))+
($probabilitas[2][$nth]*log($probabilitas[2][$nth]))+
($probabilitas[3][$nth]*log($probabilitas[3][$nth]))+
($probabilitas[4][$nth]*log($probabilitas[4][$nth]))+
($probabilitas[5][$nth]*log($probabilitas[5][$nth]))+
($probabilitas[6][$nth]*log($probabilitas[6][$nth]))
));
}
}
showb(${"nEntropy$nth"});
}