Variable scope is known as its boundary within which it can be visible or accessed from code. In other words, it is the context within which a variable is defined. There are only two scopes available in PHP namely local and global scopes.
- Local variables (local scope)
- Global variables (special global scope)
- Static variables (local scope)
- Function parameters (local scope)
When a variable is accessed outside its scope it will cause PHP error undefined variable.
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