问题
I am trying to use a PHP function from within a public static function like so (I've shortened things a bit):
class MyClass {
public static function first_function() {
function inside_this() {
$some_var = self::second_function(); // doesnt work inside this function
}
// other code here...
} // End first_function
protected static function second_function() {
// do stuff
} // End second_function
} // End class PayPalDimesale
That's when I get the error "Cannot access self:: when no class scope is active".
If I call second_function outside of the inside_this function, it works fine:
class MyClass {
public static function first_function() {
function inside_this() {
// some stuff here
}
$some_var = self::second_function(); // this works
} // End first_function
protected static function second_function() {
// do stuff
} // End second_function
} // End class PayPalDimesale
What do I need to do to be able to use second_function from within the inside_this function?
回答1:
That is because All functions in PHP have the global scope - they can be called outside a function even if they were defined inside and vice versa.
So you have to do:
function inside_this() {
$some_var = MyClass::second_function();
}
回答2:
Works with PHP 5.4:
<?php
class A
{
public static function f()
{
$inner = function()
{
self::g();
};
$inner();
}
private static function g()
{
echo "g\n";
}
}
A::f();
Output:
g
回答3:
Try changing your first function to
public static function first_function() {
$function = function() {
$some_var = self::second_function(); // now will work
};
///To call the function do this
$function();
// other code here...
} // End first_function
来源：https://stackoverflow.com/questions/11255095/cannot-access-self-when-no-class-scope-is-active