Yes, there are some. Looking for a PHP version? I was looking for a PHP 5.1 codepad (run PHP code online for test purposes), but was not able to. I remember there was one, but I have not found it.
Here is the list I came up so far before you need to click through hundreds of search results:
|writecodeonline.com||PHP 4.4.9||Legacy needs?|
|codepad.org||PHP 5.2.5||Many languages, good history|
|ideone.com||PHP 5.2.12 (pl0-gentoo)||Many langauges, good history|
|freephptest.com||PHP 5.2.17||Not very accessible|
|coderun.com (ide)||PHP 5.3.1||Not suitable for quick testing|
|phpcodepad.com||PHP 5.3.2||Not very accessible|
|codepad.viper-7.com||PHP 5.2, PHP 5.3, PHP 5.4 + trunk||A PHP coders paradise|
|3v4l.org||70+ different PHP versions!||Compat checking needed?|
The test I did run was a simple
<?php echo PHP_VERSION; , the codepads differ what they support, sometimes they are down.