PHP 5 Constants. Constants are like variables except that once they are defined they cannot be changed or undefined. PHP Constants. A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across the entire script. Create a PHP Constant.
Pressure sores that do not heal may also cause sinus tracts to form. Sinus tracts are passages that connect the infected area of the skin surface or the sore to other structures, such as those deep in the body. For example, a sinus tract from a pressure sore near the pelvis can connect to the bowel.
A feeling of pressure behind your eyes doesnât always stem from a problem inside your eyes. It usually starts in another part of your head. Though eye conditions can cause eye pain and vision problems, they rarely cause pressure. Even glaucoma, which is caused by a buildup of pressure inside the eye, doesnât cause a feeling of pressure. Eye conditions like pink eye or allergies can cause eye pain, but not pressure. Pain generally feels like a stabbing, burning, or stinging sensation. Pressure behind the eyes feels like fullness or a stretching sensation inside the eye.