I know this question sounds silly, and seems like a duplicate to the other questions, but I can almost assure you it is not a duplicate.
I am getting an issue from PHP:
Notice: Undefined index: content in FILE_PATH on line 21
 => Array
[id] => 1
[page] => About Us
[content] => I have stuff here.... content for test purpose.
print_r looks like you need to correct the source, or use:
$about is an array of array that contains the
content index. One of the solution is to use:
$about = $about; // Only if you know that this is the only case.
The right way is to correct at the source, why it is not being a source array, but has another sub-array.