Description:
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There is a nasty little gotcha in 'strip_tags', if you have a single quote inside an html comment strip_tags will ignore the end-of-comment tag!

So, <!-- test --> this works, but <!-- test I've --> this does not, the end-of-comment tag will be ignored.



Reproduce code:
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$i = "<!-- testing I've been to mars --> quite so";

echo(strip_tags($i));



Expected result:
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It should read "quite so", instead it returns a blank string, presumably because no end quote was encountered (the parser has probably switched into 'attribute' mode, but in a comment there are no attributes). Adding another quote to the above example will verify this hypothesis.



Actual result:
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an empty string.