What PHP coding flaw could bring down 70 percent of the internet?

Government websites in Europe and elsewhere went offline after critical vulnerabilities were disclosed in PHP, a programming language used by a vast number of websites. PHP developers released urgent fixes on Wednesday and urged all users to update immediately after details leaked online the previous day. Found with the help of artificial intelligence, the two flaws, nicknamed PHP2Shell, involve how PHP handles fatal errors and could let attackers run code or extract passwords and other credentials from server memory. Each vulnerability received a critical severity score of 9.2 out of 10, and experts warned of a possible wave of intrusions.