note 102373 added to function.addslashes

I want to insert into db for example 
$a= 'qwe"qwe"qwe';
$a = addslashes($a);
But when I insert $a in my db i see    qwe"qwe"qwe    i want to be qwe\"qwe\"qwe 
can you tell me how to do that
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Manual Page -- http://www.php.net/manual/en/function.addslashes.php
Edit        -- https://master.php.net/note/edit/102373
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