Update return type of spl_autoload_functions on PHP8.0+
#2810
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The documentation states that spl_autoload_functions might only return false on PHP versions up to 7.4; it will return an empty array on PHP8+.
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The documentation states that
spl_autoload_functionsmight only returnfalseon PHP versions up to 7.4; it will return an empty array on PHP8+.The PHP8.x stubs already have the (only) correct native return type
arrayspecified - with this change the functionMap type should be a subtype of it.