Basing on the "bash" tag in your question, I write my solution in bash.
Rather than URLs posted in comments:
...I like PHP changelog more: even though it is HTML and not XML, it follows more strict structure. Notice how the news interchange "relased!" and "is now available", plus a wild "re:" message appears.
So I came up with this script:
wget 'https://php.net/ChangeLog-5.php' -qO -|grep h3|sed 's/<[^<>]*>//g'
Which outputs following list:
Version 5.6.10
Version 5.5.26
Version 5.4.42
Version 5.6.9
Version 5.5.25
Version 5.4.41
Version 5.6.8
Version 5.5.24
Version 5.4.40
Version 5.6.7
Version 5.5.23
Version 5.4.39
Version 5.6.6
Version 5.5.22
Version 5.4.38
Version 5.6.5
Version 5.5.21
Version 5.4.37
Version 5.6.4
Version 5.5.20
Version 5.4.36
Version 5.6.3
Version 5.5.19
Version 5.4.35
Version 5.6.2
Version 5.5.18
Version 5.4.34
Version 5.6.1
Version 5.5.17
Version 5.4.33
Version 5.6.0
Version 5.5.16
Version 5.4.32
Version 5.3.29
Version 5.5.15
Version 5.4.31
Version 5.5.14
Version 5.4.30
Version 5.5.13
Version 5.4.29
Version 5.5.12
Version 5.4.28
Version 5.5.11
Version 5.4.27
Version 5.5.10
Version 5.4.26
Version 5.5.9
Version 5.4.25
Version 5.5.8
Version 5.4.24
Version 5.5.7
Version 5.5.6
Version 5.4.23
Version 5.4.22
Version 5.5.5
Version 5.4.21
Version 5.5.4
Version 5.4.20
Version 5.5.3
Version 5.4.19
Version 5.5.2
Version 5.4.18
Version 5.5.1
Version 5.3.28
Version 5.3.27
Version 5.5.0
Version 5.4.17
Version 5.4.16
Version 5.3.26
Version 5.4.15
Version 5.3.25
Version 5.4.14
Version 5.3.24
Version 5.4.13
Version 5.3.23
Version 5.4.12
Version 5.3.22
Version 5.4.11
Version 5.3.21
Version 5.4.10
Version 5.3.20
Version 5.4.9
Version 5.3.19
Version 5.4.8
Version 5.3.18
Version 5.4.7
Version 5.3.17
Version 5.4.6
Version 5.3.16
Version 5.4.5
Version 5.3.15
Version 5.4.4
Version 5.3.14
Version 5.4.3
Version 5.3.13
Version 5.4.2
Version 5.3.12
Version 5.4.1
Version 5.3.11
Version 5.4.0
Version 5.3.10
Version 5.3.9
Version 5.3.8
Version 5.3.7
Version 5.3.6
Version 5.3.5
Version 5.2.17
Version 5.2.16
Version 5.3.4
Version 5.2.15
Version 5.3.3
Version 5.2.14
Version 5.3.2
Version 5.2.13
Version 5.3.1
Version 5.3.0
Version 5.2.12
Version 5.2.11
Version 5.2.10
Version 5.2.9
Version 5.2.8
Version 5.2.7
Version 5.2.6
Version 5.2.5
Version 5.2.4
Version 5.2.3
Version 5.2.2
Version 5.2.1
Version 5.2.0
Version 5.1.6
Version 5.1.5
Version 5.1.4
Version 5.1.3
Version 5.1.2
Version 5.1.1
Version 5.1.0
Version 5.0.5
Version 5.0.4
Version 5.0.3
Version 5.0.2
Version 5.0.1
Version 5.0.0
Version 5.0.0 Release Candidate 3
Version 5.0.0 Release Candidate 2
Version 5.0.0 Release Candidate 1
Version 5.0.0 Beta 4
Version 5.0.0 Beta 3
Version 5.0.0 Beta 2
Version 5.0.0 Beta 1
If you want to get dates and such, I recommend using BeautifulSoup + Python for this rather than bash. Dates seem to be placed in either <b></b>
or <time></time>
tags, although I was unable to tell the reason why.
If you however have access to git, I recommend using git ls-remote
mentioned in jackflash's answer.