- array_slice: documentation ( source)
- print_r: documentation ( source)
<?php
$chunk_size = 3;
$sequences = array('a','b','c','d','e');
while(count($sequences) > 0){
$small_chunk = array_slice($sequences, 0, $chunk_size);
$sequences = array_slice($sequences, $chunk_size);
print_r($small_chunk);
print_r($sequences);
}