Question

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Override default php function

Is there a way to detect that a function is being called and override with a separate function? I’m not sure function_exists does that.

Answer 1

Override default php function

You can use namespaces to override
existing function names:

namespace blarg;
function basename() {
    return 'whatever';
}
$base = basename();

I.e., any call to basename() within
the blarg namespace will use your new
version of the function.