I came across a weird error in PHP: mysql() I tried with three different

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Asked: June 13, 20262026-06-13T06:21:19+00:00 2026-06-13T06:21:19+00:00

I came across a weird error in PHP: mysql() I tried with three different

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I came across a weird error in PHP:

mysql()

I tried with three different setups, and each time declaring a function with this name and any or no arguments generates an error:

Fatal error: Cannot redeclare mysql()

Yet, I cannot find a function with such name in the function index, if it really existed I guess it would have been here. I tried searching the web but the ambiguity of my search queries makes any info on this difficult to find.

Usefullness of having a function called simply mysql() aside, what is this function and why is it not documented?

Possibilities I ruled out:

That it could be a class constructor (there is no such class)
That the name of the module is the cause of conflict (doesn’t work with other modules, like mssql)