diff --git a/phpcs.xml b/phpcs.xml
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -2,6 +2,11 @@
 <ruleset name="Nasqueron">
     <rule ref="vendor/nasqueron/codestyle/CodeSniffer/ruleset.xml" />
 
+    <!-- Allow dprint_r() and dieprint_r() legacy debug function names -->
+    <rule ref="Generic.NamingConventions.CamelCapsFunctionName.NotCamelCaps">
+        <exclude-pattern>*/_register_to_global_space.php</exclude-pattern>
+    </rule>
+
     <file>src</file>
     <file>tests</file>
 </ruleset>
diff --git a/src/Debug/Debugger.php b/src/Debug/Debugger.php
new file mode 100644
--- /dev/null
+++ b/src/Debug/Debugger.php
@@ -0,0 +1,32 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Debug;
+
+class Debugger {
+
+    /**
+     * Prints human-readable information about a variable, wrapped in a <pre> block
+     *
+     * @param mixed $variable the variable to dump
+     */
+    public static function printVariable ($variable) : void {
+        echo "<pre class='debug'>";
+        print_r($variable);
+        echo "</pre>";
+    }
+
+    public static function printVariableAndDie ($variable) : void {
+        static::printVariable($variable);
+        die;
+    }
+
+    ///
+    /// Comfort debug helper to register debug method in global space
+    ///
+
+    public static function register () : void {
+        require_once '_register_to_global_space.php';
+    }
+
+}
diff --git a/src/Debug/_register_to_global_space.php b/src/Debug/_register_to_global_space.php
new file mode 100644
--- /dev/null
+++ b/src/Debug/_register_to_global_space.php
@@ -0,0 +1,17 @@
+<?php
+
+/* This code is intentionnally left in the global namespace. */
+
+use Keruald\OmniTools\Debug\Debugger;
+
+if (!function_exists("dprint_r")) {
+    function dprint_r ($variable) {
+        Debugger::printVariable($variable);
+    }
+}
+
+if (!function_exists("dieprint_r")) {
+    function dieprint_r ($variable) {
+        Debugger::printVariableAndDie($variable);
+    }
+}
diff --git a/tests/Debug/DebuggerTest.php b/tests/Debug/DebuggerTest.php
new file mode 100644
--- /dev/null
+++ b/tests/Debug/DebuggerTest.php
@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Debug;
+
+use Keruald\OmniTools\Debug\Debugger;
+use PHPUnit\Framework\TestCase;
+
+class DebuggerTest extends TestCase {
+
+    ///
+    /// Unit tests
+    ///
+
+    public function testRegister () {
+        $this->assertTestSuiteStateIsValid();
+
+        Debugger::register();
+
+        $this->assertTrue(function_exists("dprint_r"));
+    }
+
+    private function assertTestSuiteStateIsValid() : void {
+        $this->assertFalse(
+            function_exists("dprint_r"),
+            "Configure the test suite so dprint_r isn't in global space first."
+        );
+    }
+
+    ///
+    /// Integration tests
+    ///
+
+    /**
+     * @dataProvider provideDebuggerScripts
+     */
+    public function testDebuggerScript ($script, $message) : void {
+        $this->assertProgramMatchesOutput($script, $message);
+    }
+
+    private function assertProgramMatchesOutput(string $script, string $message = "") : void {
+        $filename = __DIR__ . "/testers/$script";
+
+        $expected = file_get_contents($filename . ".txt");
+        $actual = `php $filename.php`;
+
+        $this->assertSame($expected, $actual, $message);
+    }
+
+    public function provideDebuggerScripts () : iterable {
+        yield ["dump_integer", "Can't dump a variable"];
+        yield ["dump_array", "Can't dump an array"];
+        yield ["dump_object", "Can't dump an object"];
+        yield ["check_die", "printVariableAndDie doesn't die"];
+    }
+
+}
diff --git a/tests/Debug/testers/Counter.php b/tests/Debug/testers/Counter.php
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/Counter.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Acme;
+
+/**
+ * Mock class to get an object to dump by dump_object.php
+ */
+class Counter {
+    private $counter = "4";
+}
diff --git a/tests/Debug/testers/check_die.php b/tests/Debug/testers/check_die.php
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/check_die.php
@@ -0,0 +1,10 @@
+<?php
+
+use Keruald\OmniTools\Debug\Debugger;
+
+// Include Debugger class file
+$libDirectory = dirname(__DIR__, 3);
+require $libDirectory . "/src/Debug/Debugger.php";
+
+Debugger::printVariableAndDie("foo");
+echo "The script didn't die as expected.";
diff --git a/tests/Debug/testers/check_die.txt b/tests/Debug/testers/check_die.txt
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/check_die.txt
@@ -0,0 +1 @@
+<pre class='debug'>foo</pre>
\ No newline at end of file
diff --git a/tests/Debug/testers/dump_array.php b/tests/Debug/testers/dump_array.php
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/dump_array.php
@@ -0,0 +1,10 @@
+<?php
+
+use Keruald\OmniTools\Debug\Debugger;
+
+// Include Debugger class file
+$libDirectory = dirname(__DIR__, 3);
+require $libDirectory . "/src/Debug/Debugger.php";
+
+Debugger::printVariableAndDie(["foo" => "bar"]);
+echo "The script didn't die as expected.";
diff --git a/tests/Debug/testers/dump_array.txt b/tests/Debug/testers/dump_array.txt
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/dump_array.txt
@@ -0,0 +1,5 @@
+<pre class='debug'>Array
+(
+    [foo] => bar
+)
+</pre>
\ No newline at end of file
diff --git a/tests/Debug/testers/dump_integer.php b/tests/Debug/testers/dump_integer.php
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/dump_integer.php
@@ -0,0 +1,9 @@
+<?php
+
+use Keruald\OmniTools\Debug\Debugger;
+
+// Include Debugger class file
+$libDirectory = dirname(__DIR__, 3);
+require $libDirectory . "/src/Debug/Debugger.php";
+
+Debugger::printVariable(1 + 1);
diff --git a/tests/Debug/testers/dump_integer.txt b/tests/Debug/testers/dump_integer.txt
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/dump_integer.txt
@@ -0,0 +1 @@
+<pre class='debug'>2</pre>
\ No newline at end of file
diff --git a/tests/Debug/testers/dump_object.php b/tests/Debug/testers/dump_object.php
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/dump_object.php
@@ -0,0 +1,11 @@
+<?php
+
+use Keruald\OmniTools\Debug\Debugger;
+use Acme\Counter;
+
+// Include Debugger class file
+$libDirectory = dirname(__DIR__, 3);
+require $libDirectory . "/src/Debug/Debugger.php";
+require "Counter.php";
+
+Debugger::printVariableAndDie(new Counter);
diff --git a/tests/Debug/testers/dump_object.txt b/tests/Debug/testers/dump_object.txt
new file mode 100644
--- /dev/null
+++ b/tests/Debug/testers/dump_object.txt
@@ -0,0 +1,5 @@
+<pre class='debug'>Acme\Counter Object
+(
+    [counter:Acme\Counter:private] => 4
+)
+</pre>
\ No newline at end of file