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  1. <?php
  2.  
  3. $str = "this is isolated is an  example of this and that";
  4. $testArray = array('is','isolated','somethingElse');
  5. foreach($testArray as $tag){
  6.    $str = preg_replace("~\b(?<!#)".$tag."~i","#\$0",$str);
  7. }
  8. echo $str;
Success #stdin #stdout 0.02s 52488KB
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Standard input is empty
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this #is #isolated #is an  example of this and that
https://ideone.com/mbCfHF
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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