Look at these 3 URLS:

PHP
http://osvdb.org/searchdb.php?action...&Search=Search

Python
http://osvdb.org/searchdb.php?action...&Search=Search

Ruby
http://osvdb.org/searchdb.php?action...&Search=Search

In short:
230 pages of PHP vulnerabilites compared to 25 Python vulnerabilities and 17 Ruby vulnerabilities

Does it mean PHP is more prone to vulnerabilities?