quoted printable decode not working on plain/text emails

Output is blank, removing spaces helps but only a little.

[JAB Creations]

Here is some quote printable text from an email...

=0A=0A=A0=0AJohn=0A(800) 123-4567=0A=0A----- Forwarded Message =

=20=0ASent:=20Thursday,=20July=204,=202013=204:14=20PM=0ASubject:=20Your=20Despicab=

le=20Me=202=20iTunes=20Download=0A=20=0A=0A=0ADespicable=20Me=202=20=0A=20=20=0A=20Your=20purchase=20=

of=20tickets=20for=20Despicable=20Me=202=20has=20earned=20you=20a=20complimentary=20download=20of=20t=

he=20song=20'Just=20a=20Cloud=20Away'=20by=20Pharrell=20from=20the=20Original=20Motion=20Picture=20So=

undtrack=20on=20iTunes.=20=0AWe=20hope=20you=20enjoy=20the=20song=20and=20the=20film!=0AIf=20you=20ha=

ve=20iTunes=20installed,=20click=20here=20to=20start=20your=20complimentary=20download.=0AIF=20=

YOU=20DO=20NOT=20HAVE=20iTunes=20INSTALLED:=0A=0A1.=20Download=20iTunes=20for=20Mac=20or=20Window=

s,=20free=20of=20charge=20at=20www.iTunes.com.=20=0A2.=20Open=20iTunes=20and=20click=20iTunes=20Sto=

re.=20=0A3.=20Click=20Redeem=20under=20Quick=20Links.=20=0A4.=20Enter=20the=20code=20below.=20Your=20=

download=20will=20start=20immediately.=20Enjoy.=20=0ADownload=20Code:=20FML6H34XXTMJ=20=0AC=

Unfortunately when I use...

$b = quoted_printable_decode($b);

...the output is blank.

There were some spaces so I tried to replace them...

if (stristr($b,' ')) {$b = str_replace(' ','=20',$b);}

...and that seemed to sort of help.

I've come across a couple sites where converting this text worked, how come it's not working for me?

Here are the relevant email headers...

Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

- John

[JAB Creations]

Well I have a temporary work-around...

I looked out the source output and discovered the dreaded black diamonds with question marks in them. After comparing the before and after I found the culprit to be "=A0" (without quotes).

I am using this temporarily until I can discover how to deal with this unknown entity...

if (stristr($b,'=A0')) {$c = str_replace('=A0','',$b);}

Can anyone please post a link to a page with a table containing the character codes using in quoted printable? Either I'm not referencing the terminology right for the past three days or my understanding of it needs a little added accuracy.

- John

[phranque]

the =XX strings look like ascii character codes in hexadecimal, so =20 is a blank space character and =0A is a new line character.
it also looks like there's an extraneous "=" at the end of each line.

[swa66]

with hexdec() [php.net...] and chr() [php.net...] , you should be able to replace them all back to what they were before the encoding, but take great care what you do next with that data. It can contain *anything* evil.