Allan MacGregor introduces you to Psych in his latest post today. Psysh is a runtime developer console, interactive debugger and REPL for PHP.

Psysh is actually more than a simple REPL it's also an interactive debugger; which means you can say goodbye to the endless barrage of var_dump() and die() statements. But do we really need another REPL for PHP, well honestly we could probably get by with the solutions currently available however Psysh has an extremely interesting Ace under the sleeve, it can also function as a realtime debugger.

He includes a few terminalcasts showing some of the commands Psysh offers from the expected output of variable value out to a handy link to the PHP documentation. An example of the useful object output is also included, enabling the showing of methods and properties.