MS Bing API kullanmaya çalışıyorum

$data = file_get_contents("http://api.microsofttranslator.com/V2/Ajax.svc/Speak?appId=APPID&text={$text}&language=ja&format=audio/wav");
$data = stripslashes(trim($data));

The data returned has a ' ' character in the first character of the returned string. It is not a space because I trimed it before returning the data.

'karakteri% EF% BB% BF olduğu ortaya çıktı

Bu, Microsoft'tan belki bir hata olur, neden acaba?

My question is simply, How can I remove this %EF%BB%BF in PHP?

Thank You