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In PHP, arrays can be combined based on the endings of their keys using the following steps:

1. First, define two arrays to be combined.

2. Loop through the first array using a foreach loop.

3. Check each key of the first array to see if it ends with a certain suffix. This can be done using the substr() function to extract the last few characters of the string.

4. If the suffix matches, add the value of the key in the first array to the corresponding key in the second array.

5. If the suffix does not match, add the key and value to the second array as a new entry.

6. After looping through the first array, the second array will contain all the combined values.

Here's an example code snippet:

$array1 = array(
   "apple_1" => "red",
   "banana_2" => "yellow",
   "orange_1" => "orange"
);

$array2 = array(
   "apple_2" => "green",
   "banana_1" => "green",
   "orange_2" => "orange"
);

foreach($array1 as $key => $value){
   $suffix = substr($key, -2); //get last two characters of key
   if($suffix == "_1"){
      //add value to corresponding key in array2
      $new_key = str_replace("_1", "_2", $key); //replace suffix with "_2"
      $array2[$new_key] = $value;
   } else {
      //add key and value as new entry in array2
      $array2[$key] = $value;
   }
}

print_r($array2);

Output:

Array
(
    [apple_2] => red
    [banana_1] => green
    [orange_2] => orange
    [banana_2] => yellow
)

In this example, the two arrays are combined by replacing the "1" suffix in the keys of the first array with "2" and adding their corresponding values to the second array. If the key in the first array does not end with "_1", it is simply added as a new entry in the second array.