How to debug interactive command line of PHP functions with PsySH?

PsySH provides an interactive PHP debugging command line interface to test code in real time without setting breakpoints or modifying the code. Its usage includes: Install PsySH: composer global require psy/psysh Start PsySH: psysh Define the function to be debugged: $multiply = function ($a, $b) {return $a * $b;} Call the function: multiply(2 , 3) Use the auto-complete function to view function signatures and information

How to use PsySH to debug the interactive command line of PHP functions

PsySH is an interactive debugging command line interface for PHP code. It allows you to quickly test your code in real time without setting breakpoints or modifying your code.

Install PsySH

The easiest way to install PsySH is to use Composer:

composer global require psy/psysh

Using PsySH

To start PsySH, run the following command:

psysh

This will open a PsySH instance in your terminal.

Debugging PHP functions in PsySH

To debug a PHP function, you can define it as a closure in PsySH:

$multiply = function ($a, $b) {
    return $a * $b;
};

Now, You can call the function by name:

multiply(2, 3)

This will print the result in the terminal:

6

You can use PsySH's autocomplete feature to view the function signature and other information.

Practical Case

Suppose you are developing a function to count the number of words in a string. You can debug it in PsySH by following these steps:

1. Define a function called countWords:

$countWords = function ($string) {
    return str_word_count($string);
};

2. At the command line Call the function in:

countWords("Hello, world!")

3. You will see the result:

2

4. If you want to view the source code of the function, you can use dump Commands:

dump(countWords)

Other Tips

• PsySH has a rich command set that allows you to inspect variables, run arbitrary code, and View the function trace.
• PsySH supports a variety of frameworks and libraries, including Laravel and Symfony.
• You can exit a session using the exit command in PsySH.

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