drupal - php array selector unsure of differnce -

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Hi I'm working with Drupal and it uses arrays at one level. I'm not much with the family , I have a quick question which is the difference between these 'selectors' (which is the correct word)? $ node ['field_geoloc']

This is an error cause "Fatal Error: Can not use type object as stdClass array ... " 

 / Pre> 
 This works (im is using it in an if! = Null statement)  
  $ node- & gt; Field_geoloc   
 Hope that's a simple question ... thanks.   
 
 
 is very easy .. error says all this:  
 
 "Fatal Error: You can not use type objects as stdClass as an array ..."   
 You are trying to use an object as an array.  
 The object property is not accessible using the  $ array ['key']  method, which you have used, the need to use properties like you Is:  
  `$ Object-> Property '  
 If you have any object, you can obtain properties from that array using the method but I know from experience that you have to do that method with $ node in the drawer Should not be used.

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