[_COLOURFUL]

PHP Code:

#include <sourcemod>

static String:KVPath[PLATFORM_MAX_PATH];

public OnPluginStart() 
{
    CreateDirectory("addons/sourcemod/configs",3);
    BuildPath(Path_SM, KVPath, sizeof(KVPath), "configs/speech.cfg");
}

public OnClientPutInServer(client)
{
    SavePlayerInfo(client);
}

public SavePlayerInfo(client)
{
    new Handle:DB = CreateKeyValues("PlayerInfo");
    FileToKeyValues(DB, KVPath);
    
    new String:SID[32];
    GetClientAuthId(client, AuthId_Steam2, SID, sizeof(SID));
    
    if(KvJumpToKey(DB, SID, true))
    {
        new String:name[MAX_NAME_LENGTH], String:temp_name[MAX_NAME_LENGTH];
        GetClientName(client, name, sizeof(name));
        
        KvGetString(DB, "name", temp_name, sizeof(temp_name), "NULL")
        
        new connections = KvGetNum(DB, "connections", 0);
        
        if(StrEqual(temp_name, "NULL") && connections == 0)
        {
            PrintToChatAll("%s is new to the server!", name);
        }else {
            PrintToChatAll("%s last connect as %s.And he has %d connections", name, temp_name, connections);
        }
        connections = connections + 1;
        KvGetNum(DB, "connections", connections);
        KvSetString(DB, "name", name);
        
        KvRewind(DB);
        KeyValuesToFile(DB, KVPath);
        CloseHandle(DB);
    }
} 


PHP Code:

"PlayerInfo"
{
    "STEAM_0:0:135383138"
    {
        "name"        "NAMO <3"
    }
} 


As you can see the plugins never count the connection times.
Where is wrong of this code?

[Peace-Maker]

You need to use KvSetNum.

[_COLOURFUL]

AHHHHHHHHHHHHHHHHHHHHHHHHHHH I'm such a retarded.
Btw, Thank you your answer <3