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  1. <?php
  2.  
  3. $keywords = "word1, word2, word3";
  4.  
  5. $keyarr = array_map('trim', explode(",", $keywords));
  6. $keyarr = array_combine($keyarr, array_fill(0, count($keyarr), "your url goes here"));
  7.  
  8. print_r($keyarr);
Success #stdin #stdout 0.02s 13112KB
stdin
Standard input is empty
stdout
Array
(
    [word1] => your url goes here
    [word2] => your url goes here
    [word3] => your url goes here
)