You can use this natives from engine
PHP Code:
/* Finds an entity in the world, will return 0 if nothing is found */
native find_ent_by_class(iIndex, const szClass[]);
//optionally you can set a jghg2 type
// 1: target, 2:targetname, 0:classname (default)
native find_ent_by_owner(iIndex, const szClass[], iOwner, iJghgType=0);
native find_ent_by_target(iIndex, const szClass[]);
native find_ent_by_tname(iIndex, const szClass[]);
native find_ent_by_model(iIndex, const szClass[], const szModel[]);
native find_ent_in_sphere(start_from_ent, const Float:origin[3], Float:radius);
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