An interactive shell for modern PHP.

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v0.6.1 2015-11-12 16:18 UTC


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PsySH is a runtime developer console, interactive debugger and REPL for PHP. Learn more at Check out the Interactive Debugging in PHP talk from OSCON on Presentate.


Download the psysh phar to install:

chmod +x psysh

It's even awesomer if you put it somewhere in your system path (like /usr/local/bin or ~/bin)!

PsySH is available via Composer, so you can use it in your project as well:

composer require psy/psysh:@stable

Or you can use by checking out the the repository directly:

git clone
cd psysh

PsySH configuration

While PsySH strives to detect the right settings automatically, you might want to configure it yourself. Just add a file to ~/.config/psysh/config.php (or C:\Users\{USER}\AppData\Roaming\PsySH\config.php on Windows):


return array(
    // In PHP 5.4+, PsySH will default to your `cli.pager` ini setting. If this
    // is not set, it falls back to `less`. It is recommended that you set up
    // `cli.pager` in your `php.ini` with your preferred output pager.
    // If you are running PHP 5.3, or if you want to use a different pager only
    // for Psy shell sessions, you can override it here.
    'pager' => 'more',

    // Sets the maximum number of entries the history can contain.
    // If set to zero, the history size is unlimited.
    'historySize' => 0,

    // If set to true, the history will not keep duplicate entries.
    // Newest entries override oldest.
    // This is the equivalent of the HISTCONTROL=erasedups setting in bash.
    'eraseDuplicates' => false,

    // By default, PsySH will use a 'forking' execution loop if pcntl is
    // installed. This is by far the best way to use it, but you can override
    // the default by explicitly enabling or disabling this functionality here.
    'usePcntl' => false,

    // PsySH uses readline if you have it installed, because interactive input
    // is pretty awful without it. But you can explicitly disable it if you hate
    // yourself or something.
    'useReadline' => false,

    // PsySH automatically inserts semicolons at the end of input if a statement
    // is missing one. To disable this, set `requireSemicolons` to true.
    'requireSemicolons' => true,

    // While PsySH respects the current `error_reporting` level, and doesn't throw
    // exceptions for all errors, it does log all errors regardless of level. Set
    // `errorLoggingLevel` to 0 to prevent logging non-thrown errors. Set it to any
    // valid `error_reporting` value to log only errors which match that level.
    'errorLoggingLevel' => E_ALL & ~E_NOTICE,

    // "Default includes" will be included once at the beginning of every PsySH
    // session. This is a good place to add autoloaders for your favorite
    // libraries.
    'defaultIncludes' => array(
        __DIR__ . '/include/bootstrap.php',

    // While PsySH ships with a bunch of great commands, it's possible to add
    // your own for even more awesome. Any Psy command added here will be
    // available in your Psy shell sessions.
    'commands' => array(
        // The `parse` command is a command used in the development of PsySH.
        // Given a string of PHP code, it pretty-prints the
        // [PHP Parser]( parse tree. It
        // prolly won't be super useful for most of you, but it's there if you
        // want to play :)
        new \Psy\Command\ParseCommand,

    // PsySH uses symfony/var-dumper's casters for presenting scalars, resources,
    // arrays and objects. You can enable additional casters, or write your own!
    // See
    'casters' => array(
        'MyFooClass' => 'MyFooClassCaster::castMyFooObject',

    // You can disable tab completion if you want to. Not sure why you'd want to.
    'tabCompletion' => false,

    // You can write your own tab completion matchers, too! Here are some that enable
    // tab completion for MongoDB database and collection names:
    'tabCompletionMatchers' => array(
        new \Psy\TabCompletion\Matcher\MongoClientMatcher,
        new \Psy\TabCompletion\Matcher\MongoDatabaseMatcher,

    // If multiple versions of the same configuration or data file exist, PsySH will
    // use the file with highest precedence, and will silently ignore all others. With
    // this enabled, a warning will be emitted (but not an exception thrown) if multiple
    // configuration or data files are found.
    // This will default to true in a future release, but is false for now.
    'warnOnMultipleConfigs' => true,

Downloading the manual

The PsySH doc command is great for documenting source code, but you'll need a little something extra for PHP core documentation. Download one of the following PHP Manual files and drop it in ~/.local/share/psysh/ (or C:\Users\{USER}\AppData\Roaming\PsySH\ on Windows):

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