Scripting Languages: PHP, Perl, Python, Ruby

a side-by-side reference sheet

1. arithmetic and logic
2. strings 
3. dates and time 
4. arrays 
5. dictionaries 
6. functions 
7. execution control 
8. environment and i/o 
9. libraries and modules 
10. objects 
11. reflection 
12. web 
13. java interop 
14. history

 http://hyperpolyglot.org/scripting