php - Unable to apply array_unique on exploded string -

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I have some database records that I want to take in an array and some of them are duplicates. Attempted to filter with array_unique but it does not appear to work on explosion () -d strings. 

  $ string = 'one two three one'; $ Explosion = array_unique (explosion (',', $ string)); Var_dump ($ blast);

Output the following: 

  array (size = 1) 0 = & gt; I also tried to use the  str_getcsv ()  function as a bit of a solution, but no one was able to use the string, 'one two three one' (length = 17)

Not benefited; 

  array_nank (str_getcsv ($ string));

What is the result of the above example?

Your string spam is delimited, not commas: 

  $ String = 'one two three one'; $ Explosion = array_unique (explosion ('', $ string)); Var_dump ($ blast);

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