php - Multiple Upload and Image names -

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I have a multiple upload form that changes the name of images after uploading: 

 ($ I = 0; $ i & lt; counts ($ _ files ['picture'] ['name']); $ i ++) {$ ext = end (explosion (".", $ _FILES ['images'] ['name'] [$ i])); $ Name = rand (1111111,9999999) '.' $ Ext. } With  print_r ($ name)  output is a string  image1.jpgimage2.jpgimage3.jpg . Why is the output string? How can I give an array? Thanks in advance 
 

  $ name [] = rand (1111111,9999999). '.' . $ Ext;

will

bonus: 

  $ ext = pathinfo ($ _ files ['picture'] ['name'] [$ I], Pathinfo_expression);

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