Fatal error: Uncaught TypeError: usort(): Argument #2 ($callback) must be a valid callback, array callback must have exactly two members in /in/kW5N1:23
Stack trace:
#0 /in/kW5N1(23): usort(Array, Array)
#1 /in/kW5N1(34): test()
#2 {main}
thrown in /in/kW5N1 on line 23
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught TypeError: usort(): Argument #2 ($callback) must be a valid callback, array must have exactly two members in /in/kW5N1:23
Stack trace:
#0 /in/kW5N1(23): usort(Array, Array)
#1 /in/kW5N1(34): test()
#2 {main}
thrown in /in/kW5N1 on line 23
Process exited with code 255.
Warning: usort() expects parameter 2 to be a valid callback, array must have exactly two members in /in/kW5N1 on line 23
Warning: Invalid argument supplied for foreach() in /in/kW5N1 on line 36