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.
What is chest pressure? Chest pressure is the sensation of a squeezing, tightening, crushing or pressing in the chest area, with or without pain. It is sometimes described as a feeling of a band tightening around your chest or of something heavy sitting on your chest. A pressure sensation can come from a condition occurring in any part of your chest, including your chest wall muscles, esophagus, heart, lungs, nerves, ribcage, or tendons. If you have pain with the pressure, it may radiate between your chest and your neck, abdomen or back. Chest pressure can be a symptom of disorders such as heartburn or gastroesophageal reflux disease (GERD).