search - Wrap text - case insensitive with php -

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If I search for Tom ARNDF and $ variable "Tom Arnfeld", I get likes as a great code in Mesecul (which is case-insensitive)

To highlight which part of the search with the query I $ variable I need to maintain the original case of $ variable . 

  $ TextToPrint = preg_replace ("/ ({$ variable}) / i", "  $ 1 , $ text)

this can help


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