PHP Array breaking -

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This works on my test environment, but there is a later version of PHP on my live server which is throwing an error And break my program

is the code 

  $ oldFile = fopen ("D: / ftpfolderreport / report /". $ Last_file, "r"); While (! FIF ($ old file)) {$ buffer = fgets ($ old file); $ Buffaloire = explosion (",", $ buffler); $ = $ Buffer ray [0]; $ Old filing array [$ K] = $ Buffer comes [1]; } Fclose ($ old file);

This row: 

  $ old filing array [$ key] = $ Buffer array [1];

is throwing this error 

  Notice: Undefined offset: 1 in D: \ apps \ wamp \ www \ compliance 2 \ CompareFTPRPPPPP line 57 I think that this is to do so that I am adding the $ key converter inside the argument. I have tried to do it as ["$ key"] and ['$'], but do not like it  
 I have tried to define the key variable in the program first but then I do not even like it. I am searching online but can not get anything for help, anybody have any ideas?  
 Thank you, Stephen.   
 
 
 Add check for blank  
  if (! Buffler Array [1])) {$ key = $ bufflerArray [0]; $ Old filing array [$ K] = $ Buffer comes [1]; }

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