PHP NULL Explained: Understanding NULL, isset(), is_null(), and unset()

Learn everything about PHP NULL values in this complete guide! Understand how to use NULL, isset(), is_null(), unset(), and how NULL behaves in functions, databases, and comparisons. Avoid common NULL-related errors and write cleaner PHP code!

📌 Topics Covered:
✔ What is NULL in PHP?
✔ Checking NULL with isset() and is_null()
✔ Handling NULL in Functions & Databases
✔ NULL Type Casting & Comparisons

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