Because my stored procedure does not return values to my php

I have a small problem, The execution of my stored procedure from my php does not return values: $op=1; the variable $op contains the number of my procedure the variable $cadena contains the search for the where

$SP="[ele].[Buscar_clientes]".$op.",".$cadena."'";
$recordSet=$fn->SP_BD($SP); 
comppruebo si hay datos
if(!$recordSet->EOF){
 while{....}
}else{
echo "error";
}

I print my variable $SP to check that it executes

[ele].[Buscar_clientes]1,'Mario|Juan'

and I execute it in my sql and it brings the data that I am looking for but in my php it falls into the error

I have already used other procedures to insert and update but the problem is only when I have a procedure that brings data.