diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 44728a2e41..835fa7190e 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -6039,6 +6039,52 @@ function _doing_it_wrong( $function_name, $message, $version ) {
 	}
 }
 
+/**
+ * Generates a user-level error/warning/notice/deprecation message.
+ *
+ * Generates the message when `WP_DEBUG` is true.
+ *
+ * @since 6.4.0
+ *
+ * @param string $function_name The function that triggered the error.
+ * @param string $message       The message explaining the error.
+ * @param int    $error_level   Optional. The designated error type for this error.
+ *                              Only works with E_USER family of constants. Default E_USER_NOTICE.
+ */
+function wp_trigger_error( $function_name, $message, $error_level = E_USER_NOTICE ) {
+
+	// Bail out if WP_DEBUG is not turned on.
+	if ( ! WP_DEBUG ) {
+		return;
+	}
+
+	/**
+	 * Fires when the given function triggers a user-level error/warning/notice/deprecation message.
+	 *
+	 * Can be used for debug backtracking.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param string $function_name The function that was called.
+	 * @param string $message       A message explaining what has been done incorrectly.
+	 * @param int    $error_level   The designated error type for this error.
+	 */
+	do_action( 'wp_trigger_error_run', $function_name, $message, $error_level );
+
+	if ( ! empty( $function_name ) ) {
+		$message = sprintf( '%s(): %s', $function_name, $message );
+	}
+
+	/*
+	 * If the message appears in the browser, then it needs to be escaped.
+	 * Note the warning in the `trigger_error()` PHP manual.
+	 * @link https://www.php.net/manual/en/function.trigger-error.php
+	 */
+	$message = esc_html( $message );
+
+	trigger_error( $message, $error_level );
+}
+
 /**
  * Determines whether the server is running an earlier than 1.5.0 version of lighttpd.
  *
diff --git a/tests/phpunit/tests/functions/wpTriggerError.php b/tests/phpunit/tests/functions/wpTriggerError.php
new file mode 100644
index 0000000000..40582bc24a
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpTriggerError.php
@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * Test cases for the `wp_trigger_error()` function.
+ *
+ * @since 6.4.0
+ *
+ * @group functions.php
+ * @covers ::wp_trigger_error
+ */
+class Tests_Functions_WpTriggerError extends WP_UnitTestCase {
+
+	/**
+	 * @ticket 57686
+	 *
+	 * @dataProvider data_should_trigger_error
+	 *
+	 * @param string $function_name    The function name to test.
+	 * @param string $message          The message to test.
+	 * @param string $expected_message The expected error message.
+	 */
+	public function test_should_trigger_error( $function_name, $message, $expected_message ) {
+		$this->expectError();
+		$this->expectErrorMessage( $expected_message );
+
+		wp_trigger_error( $function_name, $message, E_USER_ERROR );
+	}
+
+	/**
+	 * @ticket 57686
+	 *
+	 * @dataProvider data_should_trigger_error
+	 *
+	 * @param string $function_name    The function name to test.
+	 * @param string $message          The message to test.
+	 * @param string $expected_message The expected error message.
+	 */
+	public function test_should_trigger_warning( $function_name, $message, $expected_message ) {
+		$this->expectWarning();
+		$this->expectWarningMessage( $expected_message );
+
+		wp_trigger_error( $function_name, $message, E_USER_WARNING );
+	}
+
+	/**
+	 * @ticket 57686
+	 *
+	 * @dataProvider data_should_trigger_error
+	 *
+	 * @param string $function_name    The function name to test.
+	 * @param string $message          The message to test.
+	 * @param string $expected_message The expected error message.
+	 */
+	public function test_should_trigger_notice( $function_name, $message, $expected_message ) {
+		$this->expectNotice();
+		$this->expectNoticeMessage( $expected_message );
+
+		wp_trigger_error( $function_name, $message );
+	}
+
+	/**
+	 * @ticket 57686
+	 *
+	 * @dataProvider data_should_trigger_error
+	 *
+	 * @param string $function_name    The function name to test.
+	 * @param string $message          The message to test.
+	 * @param string $expected_message The expected error message.
+	 */
+	public function test_should_trigger_deprecation( $function_name, $message, $expected_message ) {
+		$this->expectDeprecation();
+		$this->expectDeprecationMessage( $expected_message );
+
+		wp_trigger_error( $function_name, $message, E_USER_DEPRECATED );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array
+	 */
+	public function data_should_trigger_error() {
+		return array(
+			'function name and message are given' => array(
+				'function_name'    => 'some_function',
+				'message'          => 'expected the function name and message',
+				'expected_message' => 'some_function(): expected the function name and message',
+			),
+			'message is given'                    => array(
+				'function_name'    => '',
+				'message'          => 'expect only the message',
+				'expected_message' => 'expect only the message',
+			),
+			'function name is given'              => array(
+				'function_name'    => 'some_function',
+				'message'          => '',
+				'expected_message' => 'some_function(): ',
+			),
+		);
+	}
+}