php undefined offset in for loop - php

Question

This has baffled me for quit a while. I want to compare my data with the data coming next to determine when to change the row.
<?php
$seasons; // laravel eloquent model from controller
$i = 0;
$max = count($seasons);
for($i; $i<$max; $i++):
$x = $i+1;
print_r($seasons[$i]); // ok
print_r($seasons[1]); // ok
print_r($seasons[0+1]); // ok
print_r($seasons[$x]); // undefined
print_r($seasons[$i+1]); // undefined
endfor;
?>

Answer 1

<?php
$seasons; // laravel eloquent model from controller
$i = 0;
$max = count($seasons);
for($i; $i<$max; $i++):
$x = $i+1;
print_r($seasons[$i]); // ok
print_r($seasons[1]); // ok
print_r($seasons[0+1]); // ok
if(isset($seasons[$x])){
print_r($seasons[$x]); // undefined
}
endfor;
?>
By the way, $x and $i+1 these both lines are same. because $x = $i + 1; and again you are doing $i + 1.

Answer 2

i over look that $x could be over the array index limit at the last loop, so i put in a check to solve the problem. if someone else have better way of doing it, let me know too.
$i = 0;
$max = count($seasons);
for($i; $i<$max; $i++):
$x = $i+1;
if($x < $max):
if($seasons[$i]->month != $seasons[$x]->month)
// do something
endif
endif;
endfor;