PHP exec() vs system() vs passthru()

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They have slightly different purposes.

  • exec() is for calling a system command, and perhaps dealing with the output yourself.
  • system() is for executing a system command and immediately displaying the output – presumably text.
  • 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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