msql_field_flags    (PHP 3 >= 3.0.7, PHP 4, PHP 5) msql_field_flags -- Get field flags 说明string  msql_field_flags ( resource result, int field_offset ) 
   msql_field_flags() returns the field flags of
   the specified field. 
   返回值
   Returns a string containing the field flags of the specified key.
   This can be: primary key not null,
   not null, primary key, 
   unique not null or unique. 
   
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