I have this piece of code that causes my script to crash. I'm certain that there is some kind of quote mark confusion on my part. Have been staring at this for an hour now and can't find the error. Any help much appreciated.
The $title can include commas, could that be it? Removing all variables fixes the issue, maybe it's an issue with how I'm adding them or what they contain?
$contentopf = "
<?xml version=\"1.0\" encoding=\"utf-8\"?>
<package xmlns=\"http://www.idpf.org/2007/opf\" unique-identifier=\"bookid\" version=\"3.0\" prefix=\"rendition: http://www.idpf.org/vocab/rendition/# ibooks: http://vocabulary.itunes.apple.com/rdf/ibooks/vocabulary-extensions-1.0/\">
<metadata xmlns=\"http://www.idpf.org/2007/opf\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" >
<dc:format>application/epub+zip</dc:format>
<meta name=\"cover\" content=\"cover-image\" />
<dc:title>".$title."</dc:title>
<meta property=\"ibooks:version\">0.3.0</meta>
<dc:creator id=\"aut\">".$fname." ".$lname"</dc:creator>
<meta refines=\"#aut\" property=\"role\" scheme=\"marc:relators\">aut</meta>
<meta refines=\"#aut\" property=\"file-as\">".$lname.", ".$fname"</meta>
<dc:description>!</dc:description>
<dc:publisher>".$publisher."</dc:publisher>
<dc:date>".$year."</dc:date>
<dc:language>".$lang."</dc:language>
<dc:identifier id='bookid'>urn:uuid:".$uuid."</dc:identifier>
<meta refines='#bookid' property='identifier-type' scheme='xsd:string'>uuid</meta>
<dc:identifier id='isbn-id'>urn:isbn:".$isbn."</dc:identifier>
<meta refines='#isbn-id' property='identifier-type' scheme='onix:codelist5'>15</meta>
<meta property=\"dcterms:modified\">".$date."</meta>
<meta property=\"rendition:layout\">pre-paginated</meta>
<meta property=\"rendition:orientation\">landscape</meta>
<meta property=\"rendition:spread\">none</meta>
<meta property=\"ibooks:specified-fonts\">true</meta>
<meta property='ibooks:iphone-orientation-lock'>landscape-only</meta>
<meta property='ibooks:ipad-orientation-lock'>landscape-only</meta>
</metadata>
";
echo $contentopf;