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Php execute command and display output

They have slightly different purposes :-

1. exec() is for calling a system command, and perhaps dealing with the
  output yourself.
2. system() is for executing a system command and immediately displaying
  the output - presumably text.
3. passthru() is for executing a system command which you wish the raw
  return from - presumably something binary.
  
Regardless, I suggest you not use any of them. They all produce highly
  unportable code.

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