Implent a function?

Hi'
I'm here to ask you, how to implent a function ? I've the error 004

Code:

error 004: function "OnPlayerKilledPlayer" is not implemented

I know what this mean, I've just to write

PHP Code:

OnPlayerKilledPlayer(playerid, deathid)
{
    // Codee..
    return 1;
} 


But this is not the purpose here. I'm looking for implementing a function without creating it like showed before.
Code:

PHP Code:

#include <a_samp>
public OnPlayerDeath(playerid, killerid, reason)
{
    #if defined OnPlayerKilledPlayer
        if(killerid != INVALID_PLAYER_ID) OnPlayerKilledPlayer(playerid, reason);
    #endif
    return 1;
} forward OnPlayerKilledPlayer(playerid, deathid); 


Thanks for helping.
NB: This is only optimization.

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Implent a function?