PHP：如何增加包含文本和数字的变量中的数字[重复]

This is quite a stupid question. I want to find out how to increase a number in the end of the variable:

$Coffee1 = "black";
$Coffee2 = "brown";
$Coffee3 = "gray";

echo $Coffee1;        => black
echo $Coffee1+1;      => brown
echo $Coffee2+1;      => gray

</div>

Here is how you can do that (code):

<?php

$Coffee1 = "black";
$Coffee2 = "brown";
$Coffee3 = "gray";

$varName = "Coffee";
for($varIdx = 1; $varIdx <= 3; $varIdx++) {
    echo "
";
    echo ${$varName . $varIdx};
}

Here is some explanation : Variable variables 1, 2

But better use arrays instead of variables in this case.

The mechanism you're looking for is an array.

http://php.net/manual/en/language.types.array.php

$coffee = [
    "black",
    "brown",
    "gray"
];

$index = 0;

echo $coffee[$index]; // "black"
echo $coffee[$index+1]; // "brown"
echo $coffee[$index+2]; // "gray"

This is also where loops become handy.

foreach($coffee as $flavor) {
    echo $flavor;
}
// "blackbrowngrey"