Psysh をなんかこうグローバルで良い感じに…うーん、良い感じの書き方がおもいつかないでござる。

psysh_test.php

<?php
// config
define("DEBUG", true);

// loading
if(DEBUG)
    include('/path/to/psysh');

// setup
set_error_handler(function($errno, $errstr, $errfile, $errline){
    throw new ErrorException($errstr, $errno, 0, $errfile, $errline);
});

// use
try{
    echo "Okay, I'll try read the file!";
    $filename = "not exists file name here.";
    file_get_contents($filename);
}catch(\Exception $e){
    if(class_exists("Psy\\Shell")){\Psy\Shell::debug(get_defined_vars());}
}

test.txt

$ php index.php
Okay, I'll try read the file!
Psy Shell v0.1.8 (PHP 5.5.9 — cli) by Justin Hileman
>>> ls
Variables: $_COOKIE, $_ENV, $_FILES, $_GET, $_POST, $_REQUEST, $_SERVER, $argc, $argv, $e, $filename
>>> ls $e
Class Properties: $xdebug_message
Class Methods: __construct, __toString, getCode, getFile, getLine, getMessage, getPrevious, getSeverity, getTrace, getTraceAsString
>>> $e->getMessage()
ErrorException with message 'Undefined variable: undefinedVariable'
>>> $e->getFile();
=> "/tmp/PsyshTest/index.php"
>>> $e->getLine();
=> 18
>>> echo $filename
not exists file name here.⏎
=> null
>>>