Description:
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When creating a tar archive containing .
Phar seems unable to extract it.
Extracting ./file1 would work, but listing or extracting the whole archive does not seem possible and fail with a Fatal internal error.
This is especially annoying if you don't know in advance the name of the file to extract: in such case the archive is simply unsuitable for Phar.

As seen on IRC, it (july 14th), it does not affect every PHP version.

Maybe related to bug #64884 since some symptoms seem common.

Test script:
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mkdir -p test1;
echo "This is a test file" > test1/file1;
tar czf test1.tar.gz -C test1 .


php -r '$p = new PharData("/tmp/test1.tar.gz"); $p->extractTo("test2");'
cat test2/file1


Expected result:
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This is a test file

Actual result:
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Extraction from phar "/tmp/test1.tar.gz" failed: Cannot extract ".", internal error in Command line code on line 1

# Note that the "test1" directory is created, but empty