[Dayrion]

GetPlayerWeapon give you the ID of the currently holding weapon by the player (https://sampwiki.blast.hk/wiki/GetPlayerWeapon) and GetPlayerWeaponData give you informations with details (https://sampwiki.blast.hk/wiki/GetPlayerWeaponData)
Code from the wiki to get a list of all player's weapon:

Код:

new weapons[13][2];
 
for (new i = 0; i <= 12; i++)
{
    GetPlayerWeaponData(playerid, i, weapons[i][0], weapons[i][1]);
}