Radio Crystals

<?php
$input = array_map("doubleval", explode(", ", readline()));
//$input = array_map("doubleval", explode(", ", "25, 24"));
$finalResult = $input[0];
$startWeigth = $input[1];
$count = 0;
if ($startWeigth+1<$finalResult){
    exit;
}
echo "Processing chunk $startWeigth microns" . PHP_EOL;
while ($startWeigth / 4 >= $finalResult) {
    $count++;
    $startWeigth = Cut($startWeigth);

}
if($count!=0) {
    echo "Cut x$count" . PHP_EOL;
    Check($startWeigth,$finalResult);
    $startWeigth=TransportingAndWashing($startWeigth);
}
Check($startWeigth,$finalResult);
$count = 0;
while ($startWeigth - (20 * $startWeigth) / 100 >= $finalResult) {
    $count++;
    $startWeigth = Lap($startWeigth);
}
if($count!=0) {
    echo "Lap x$count" . PHP_EOL;
    Check($startWeigth,$finalResult);
    $startWeigth=TransportingAndWashing($startWeigth);
}
$count = 0;
Check($startWeigth,$finalResult);
while ($startWeigth - 20 >= $finalResult) {
    $count++;
    $startWeigth = Grind($startWeigth);
}
if($count!=0) {
    echo "Grind x$count" . PHP_EOL;
    Check($startWeigth,$finalResult);
    $startWeigth=TransportingAndWashing($startWeigth);
}
$count = 0;
Check($startWeigth,$finalResult);
while ($startWeigth - 2 >= $finalResult - 1) {
    $count++;
    $startWeigth = Etch($startWeigth);
}
if($count!=0) {
    echo "Etch x$count" . PHP_EOL;
    Check($startWeigth,$finalResult);
    $startWeigth=TransportingAndWashing($startWeigth);
}
Check($startWeigth,$finalResult);
if ($startWeigth == $finalResult) {
    exit;
} else {
    $startWeigth= Xray($startWeigth);
    echo "X-ray x1" . PHP_EOL;
    Check($startWeigth,$finalResult);
    echo "Finished crystal $startWeigth microns";
}

function Check($a,$b){
    if ($a == $b) {
        echo "Finished crystal $a microns".PHP_EOL;
        exit;
    }

}
function TransportingAndWashing($a)
{
    $b=floor($a);
    echo "Transporting and washing" . PHP_EOL;
    return $b;
}

function Cut($a)
{
    $a = $a / 4;
    return $a;
}

function Lap($a)
{
    $b = $a - (20 * $a) / 100;
    return $b;
}

function Grind($a)
{
    $a = $a - 20;
    return $a;
}

function Etch($a)
{
    $a = $a - 2;
    return $a;
}

function Xray($a)
{
    $a = $a + 1;
    return $a;
}