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We have most of the podcast
stored locally.

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That means if a new episode comes out we
have to update the XML data ourselves.

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Yes, you could just link to the RSS
feed like we did with full stack radio.

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But this is a lot slower to process and,
of course,

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this course is about taking control.

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Let's find out what it takes to
control the XML data with PHP.

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Create another file in the inc directory.

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We'll name this one write_xml.

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We'll start by loading the podcast file
we wish to modify into an XML object.

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We'll be using the data
from the add_episode form.

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Simplexml_load_file and our file.

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We want to add an additional item.

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So, we're going to call the add
child method on the XML channel.

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AddChild('item').

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Then we can add our child details.

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I'm going to create a new date
object from the form input so

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that I can format it properly.

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Now, we can add the publication date.

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Date -> format, the day name,

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day, month, year, hour.

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And then for the description,
I'm going to copy the title again.

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Let's write out what we have so far so
we can preview this in the browser.

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We can use the method asXML.

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Simple XML doesn't really handle
making the XML pretty or easy to read.

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There are packages that can do this.

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But we aren't really going to be
looking at the code itself, so

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it doesn't really matter.

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It doesn't need line
breaks to be valid XML.

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But to make this a little easier for

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us to read right now,
let's add our own line breaks.

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Anywhere the tags meet.

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We're going to add a line break.

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Now, let's preview this in a browser.

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Let's pull the latest
episode of Educate Yourself.

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Add episode.

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Choose the Educate Yourself.

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And we'll enter the details.

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Great, as you can see our
new episode was added.

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But there are a few more bits of
information that I want to add.

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XML offers many additional options for
adding details.

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I'm going to demonstrate one of them.

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As you see in the previous episodes, there
are some tags that start with iTunes and

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a colon before the name of the tag.

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This is the XML way of namespacing.

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At the top of the file.

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We see these xmlns for namespace.

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And here's our iTunes namespace.

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We'll copy this and go back to workspaces.

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Itunes.

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And we just need this URL.

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Then we can add the namespace as the third
parameter of the addChild method.

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We'll copy this line for
summary, explicit, and duration.

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Now, let's preview these
changes in the browser again.

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Now, we see the iTunes
information as well.

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And we're ready to write this to a file.

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Let's comment out this display.

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Instead of echoing the asXML,

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we can call xml->asXML and pass the file.

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We'll then redirect.

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To podcasts.

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Back in the browser
let's resubmit the form.

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Since these are random, we can
refresh until we see the new episode.

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We could also specify a specific
episode if we wanted too.