<?php

$myArray =  array("A","B","C","D","E","F","I","G","H");

for($i=0; $i<count($myArray ); $i++){
    
    echo 'i = ' . $i . "\n";
    echo 'count($myArray) = ' . count($myArray) . "\n";
    var_dump($myArray );

//...Remove the first Element of this array while $i is less than it's length.

    array_shift($myArray); 
}

i = 0
count($myArray) = 9
array(9) {
  [0]=>
  string(1) "A"
  [1]=>
  string(1) "B"
  [2]=>
  string(1) "C"
  [3]=>
  string(1) "D"
  [4]=>
  string(1) "E"
  [5]=>
  string(1) "F"
  [6]=>
  string(1) "I"
  [7]=>
  string(1) "G"
  [8]=>
  string(1) "H"
}
i = 1
count($myArray) = 8
array(8) {
  [0]=>
  string(1) "B"
  [1]=>
  string(1) "C"
  [2]=>
  string(1) "D"
  [3]=>
  string(1) "E"
  [4]=>
  string(1) "F"
  [5]=>
  string(1) "I"
  [6]=>
  string(1) "G"
  [7]=>
  string(1) "H"
}
i = 2
count($myArray) = 7
array(7) {
  [0]=>
  string(1) "C"
  [1]=>
  string(1) "D"
  [2]=>
  string(1) "E"
  [3]=>
  string(1) "F"
  [4]=>
  string(1) "I"
  [5]=>
  string(1) "G"
  [6]=>
  string(1) "H"
}
i = 3
count($myArray) = 6
array(6) {
  [0]=>
  string(1) "D"
  [1]=>
  string(1) "E"
  [2]=>
  string(1) "F"
  [3]=>
  string(1) "I"
  [4]=>
  string(1) "G"
  [5]=>
  string(1) "H"
}
i = 4
count($myArray) = 5
array(5) {
  [0]=>
  string(1) "E"
  [1]=>
  string(1) "F"
  [2]=>
  string(1) "I"
  [3]=>
  string(1) "G"
  [4]=>
  string(1) "H"
}