I'm writing a custom blog engine and would like to have trackbacks similar to Wordpress. I could look at the Wordpress source, but I'd really prefer a tutorial of some sort and so far I haven't been able to find one. Are there any good tutorials for implementing trackbacks or pingbacks in PHP5?
Appearing as manual comments on the blog posts you've linked to, trackbacks alert other websites that you have linked to them. In addition to broadening your audience, trackbacks are a great way to earn backlinks. This can boost SEO if the sites that you link to are reputable and use and allow for trackbacks.
Implementing trackbacks isn't that hard at all. Here you can find the official specification and an example at the bottom.
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