CVE-2020-7066 get_headers() silently truncates after a null byte

In PHP versions 7.2.x below 7.2.29, 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while using getheaders with user-supplied URL, if the URL contains zero \0 character, the URL will be silently truncated at it. This may cause some software to make incorrect assumptions about the target of the getheade...