This tip is useful to "lazy" developers who do not even think about variable names. They may prefer magic names like ${0} and 0 is good enough variable name, why not...

His list consists of:

• Use || (or) and && (and) operations instead of if.
• Use ternary operator.
• Use for instead of while.
• In some cases PHP requires you to create a variable. [...] To handle all these situation you can create a set of small functions which shortcuts frequently used operations.
• Explore the language you use.
• When it is better to write more and then read the code easily, do not be lazy.

Check out Vidyut Luther's response to Alex's comments as well as one from Richard Heyes.