string - replace trademark symbol (™) with html code in php -

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i have following string:

$str='enzyme™ trademark';

now want put string in csv file like: 'enzyme™ trademark', `because if "™" placed in csv file, magento import product setup escapes it.
can please me on issue googled lot not found correct suggestion. sorry 4 bad english.

i tried following code: 

htmlentities($db->col['title'], ent_quotes | ent_ignore, "utf-8");//but removes '™'<br>  htmlentities($db->col['title'], ent_quotes , "utf-8"); //removes whole string <br>

using global function htmlentities in php, can convert string 'special characters' 1 using html entities. 

$variable = "enzyme™ trademark"; $convertedvariable = htmlentities($variable); echo $convertedvariable; // echos: enzyme&trade; trademark

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