array python to php -

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I have to translate a Python code to phyp, but I do not know how this Python code works in php I do not know what the colon is between: "[] between: 

  dec = data_ar [4: len (data_ar)]   
 Thanks   
 
 
 This is just so, so I think what you want:  
  Array_slice ($ data_ar, 4);

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