How do I replace tabs with spaces within variables in PHP? -

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$ data has tabs, top positions and multiple locations. Want to replace several spaces with a single space, and remove the leading spaces.

Any such thing that will close this input data: 

  [asdf asdf asdf asdf]

output data In: 

  [asdf asdf asdf asdf]

How do I do this? 

  $ data = trim (preg_replace ('/ \ s + / g', '' , $ Data));

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