From console.inc :
PHP Code:
/**
* Called when a generic console command is invoked.
*
* @param client Index of the client, or 0 from the server.
* @param args Number of arguments that were in the argument string.
* @return An Action value. Not handling the command
* means that Source will report it as "not found."
*/
typedef ConCmd = function Action (int client, int args);
so your
PHP Code:
public Action Command_hidetag(const char[] sCommand, int iClient, int sArgs)
does not match.