[shogo]

#include <amxmodx>
#include <amxmisc>
#include <fakemeta>
#include <hamsandwich>

#define PLUGIN_VERSION "1.0"

new Float:g_fPlayerSpeed[33];
new Float:g_fPlayerJump[33];
new Float:g_fPlayerInvisibility[33];

public plugin_init() {
register_plugin("Buff Knife", PLUGIN_VERSION, "shogo");

register_event("CurWeapon", "event_curweapon", "be", "1=1");
register_forward(FM_PlayerPreThink, "fw_PlayerPreThink");
register_forward(FM_PlayerPostThink, "fw_PlayerPostThink");
RegisterHam(Ham_TakeDamage, "player", "fw_PlayerTakeDamage");

register_menu("Special Knives", ADMIN_LEVEL_A, "menu_special_knives");
}

public menu_special_knives(id, level, cid) {
if (level >= ADMIN_LEVEL_A) {
new menu = menu_create("Special Knives", "menu_handler");

menu_additem(menu, "Regeneration");
menu_additem(menu, "Speed");
menu_additem(menu, "High Jump");
menu_additem(menu, "Partial Invisibility");

menu_display(id, menu, 0);
}
}

public menu_handler(id, menu, item) {
if (item != MENU_EXIT) {
switch (item) {
case 0: {
g_fPlayerSpeed[id] = 250.0;
g_fPlayerJump[id] = 300.0;
g_fPlayerInvisibility[id] = 0.5;
client_print(id, print_center, "You have equipped the Regeneration knife!");
}
case 1: {
g_fPlayerSpeed[id] = 300.0;
g_fPlayerJump[id] = 200.0;
g_fPlayerInvisibility[id] = 0.7;
client_print(id, print_center, "You have equipped the Speed knife!");
}
case 2: {
g_fPlayerSpeed[id] = 220.0;
g_fPlayerJump[id] = 400.0;
g_fPlayerInvisibility[id] = 0.6;
client_print(id, print_center, "You have equipped the High Jump knife!");
}
case 3: {
g_fPlayerSpeed[id] = 230.0;
g_fPlayerJump[id] = 250.0;
g_fPlayerInvisibility[id] = 0.4;
client_print(id, print_center, "You have equipped the Partial Invisibility knife!");
}
}
}

menu_destroy(menu);
}

public event_curweapon(id) {
static weapon;
get_user_weapon(id, weapon, _);

if (weapon == CSW_KNIFE) {
set_user_maxspeed(id, g_fPlayerSpeed[id]);
set_user_gravity(id, g_fPlayerJump[id] / 800.0);
set_user_rendering(id, kRenderFxGlowShell, 255, 255, 255, kRenderNormal, floatround(g_fPlayerInvisibility[id] * 255.0));
} else {
set_user_maxspeed(id, 250.0);
set_user_gravity(id, 1.0);
set_user_rendering(id);
}
}

public fw_PlayerPreThink(id) {
if (is_user_alive(id) && get_user_weapon(id) == CSW_KNIFE) {
health_regenerate(id);
}
}

public fw_PlayerPostThink(id) {
if (is_user_alive(id) && get_user_weapon(id) == CSW_KNIFE) {
set_user_rendering(id, kRenderFxGlowShell, 255, 255, 255, kRenderNormal, floatround(g_fPlayerInvisibility[id] * 255.0));
}
}

public fw_PlayerTakeDamage(victim, inflictor, attacker, Float:damage, damagebits) {
if (is_user_alive(victim) && get_user_weapon(victim) == CSW_KNIFE) {
return HAM_SUPERCEDE;
}
return HAM_IGNORED;
}

stock health_regenerate(id) {
static Float:health;
health = float(get_user_health(id));

if (health < 100.0) {
set_user_health(id, floatround(health + 0.5));
}
}

I'm getting errors

Error: Undefined symbol "set_user_maxspeed" on line 74
Error: Undefined symbol "set_user_gravity" on line 75
Error: Undefined symbol "set_user_rendering" on line 76
Error: Undefined symbol "set_user_maxspeed" on line 78
Error: Undefined symbol "set_user_gravity" on line 79
Error: Undefined symbol "set_user_rendering" on line 80
Error: Undefined symbol "set_user_rendering" on line 92
Error: Undefined symbol "set_user_health" on line 108