Solving KERNEL_DS Undeclared in Linux Mint 21
Hi! This Tip Try to Solve KERNEL_DS Undeclared in Mint 21.x LTS GNU/Linux.
Cause
This because set_fs get_fs Functions are Not any more Supported on Kernels 5.10+!
$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }