There's lots of data being posted no file uploads and also the $_SERVER['CONTENT_LENGTH'] has been exceeded. Is this elevated?

You will find 2 different places you are able to place it:

php.ini

post_max_size=20M
upload_max_filesize=20M

.htaccess

php_value post_max_size 20M
php_value upload_max_filesize 20M

Which to make use of is dependent on which you can get.

; Maximum allowed size for uploaded files.
upload_max_filesize = 40M

; Must be greater than or equal to upload_max_filesize
post_max_size = 40M

take a look solution

You are able to increase that in php.ini

; Maximum allowed size for uploaded files.
upload_max_filesize = 2M

You are able to specify both max publish size and max quality limit in php.ini

post_max_size = 64M
upload_max_filesize = 64M

This can be done with .htaccess:

php_value upload_max_filesize 20M
php_value post_max_size 20M