echo 'alert('Your $user_name is already exists, Please try another one!')';When I tried to sign in just to test it display error:-
Parse error: syntax error, unexpected 'Your' (T_STRING), expecting ',' or ';'
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Alive to die - Anant
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Try this echo 'alert("Your ' . $user_name . ' is already exists, Please try another one!")'; – Aju John Mar 12 '16 at 11:23