PHP - 根据内容将数组拆分为块

Question

I have an php array that that i would like split to up into smaller chunks using a loop.

Once all elements with the same values have been pushed into the chunk, i want to use that chunk for something, then continue the loop and setup the next chunk, until all content of the original $array has been used.

public function adjust($array){ 
  // $array = [1, 1, 2, 2, 8, 8, 8, 9, 20]

  $chunk = array()

  for ($i = 0; $i < sizeof($array); $i++){
   // code here
   // result should be $chunk = [1, 1] 
   // use $chunk for something, reset its contents, 
   // continue loop until chunk is [2, 2],
   // rinse and repeat
 }    
}

I dont necesarrily need a loop, i just require to be able to slice $array into 5 $chunks (for this specific example), to be able to process the data.

Is there an easier way to solve this without a bunch of if/else clauses ?

Answer 1

Initialize $chunk to an array containing the first element. Then loop through the rest of the array, comparing the current element to what's in $chunk. If it's different, process $chunk and reset it.

$chunk = array[$array[0]];
for ($i = 1; $i < count($array); $i++) {
    if ($array[$i] != $chunk[0]) {
        // use $chunk for something
        $chunk = array($array[$i]);
    } else {
        $chunk[] = $array[$i];
    }
}
// process the last $chunk here when loop is done