String-interning-String-pool.md

String-interning.md

• https://superuser.com/a/1008158
• https://www.journaldev.com/797/what-is-java-string-pool

if you have the string "foobar" 1000 times in your code, internally PHP will store 1 immutable variable for this string and just use a pointer to it for the other 999