Optimize an array function - php

Question

Here is an example of test code. I wonder how to optimize this code, knowing that in my development code, the original array comes from an API that I retrieve, then that I transform according to my needs and calculations in a class with functions methods (there is a lot of transformation in $rep with ternary operators). The example here is for simplicity:
When you call the function testArray() several hundred times, the calculation time begins to become long, too long. I wonder if there's a way to optimize this and code more elegantly.
$data = array(
"lemon" => 'test1',
"tomato" => 'test2',
"cofee" => 'test3',
"tree" => 'test4'
);
function testArray($data)
{
$rep = array(
'yellow' => $data['lemon'],
'red' => $data['tomato'],
'brown' => $data['cofee'],
'green' => $data['tree']
);
return $rep;
}
echo testArray($data)['yellow']; // test1
echo testArray($data)['red']; // test2
echo testArray($data)['brown']; // test3
echo testArray($data)['green']; // test4
thank you, I'm stuck a bit to find a more efficient way.

Answer 1

You don't need to call the function multiple time. Just store it to a variable and use it later.
$data = array(
"lemon" => 'test1',
"tomato" => 'test2',
"cofee" => 'test3',
"tree" => 'test4'
);
function testArray($data)
{
$rep = array(
'yellow' => $data['lemon'],
'red' => $data['tomato'],
'brown' => $data['cofee'],
'green' => $data['tree']
);
return $rep;
}
$transformedData = testArray($data);
echo transformedData['yellow']; // test1
echo transformedData['red']; // test2
echo transformedData['brown']; // test3
echo transformedData['green']; // test4