isset() vs. array_key_exists()

I used to think that if a variable was set to NULL isset() would return TRUE—because NULL is a value to which that variable is set. However, the PHP Manual says this is incorrect.

The array_key_exists() function avoids this confusion. It does exactly what its name specifies. The name is not misleading in any way.

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This entry was posted in PHP Arrays, PHP Data Value Types, PHP Language Constructs and tagged , , . Bookmark the permalink.

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