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Combining foreach() with list()

From: PHP 5.5 First Look

Video: Combining foreach() with list()

As a developer, one of the common tasks that I see on a regular basis is looping over a result set. Depending on the circumstances, I may need to assign a group of variables to property values or values in an array. Up to this point it's been a manual process, but in PHP 5.5, it's now possible to combine for each with List. This allows me to iterate over the array and unpack nested arrays into looped variables. Using the language construct list as a variable. There is a limitation, I can't use list as a key element, which makes sense.

Combining foreach() with list()

As a developer, one of the common tasks that I see on a regular basis is looping over a result set. Depending on the circumstances, I may need to assign a group of variables to property values or values in an array. Up to this point it's been a manual process, but in PHP 5.5, it's now possible to combine for each with List. This allows me to iterate over the array and unpack nested arrays into looped variables. Using the language construct list as a variable. There is a limitation, I can't use list as a key element, which makes sense.

How am I going to get multiple keys? This sounds neat, in theory, so let's see it in action. If we look at the log, we can see it's pretty straight forward. And it's rendering some kind of log entry that's stored in the database. Let's see what that code looks like. I'm going to go back to the IDE. Then navigate to Classes>Log.php. Take a look at the method toHtml. There's a 4H Loop that goes through each row and sends variables to a method that parses them cleanly.

Row zero, row one, row two, row three. Now, this is perfectly functional code, but talk about ovsication. I could tell the database query to return an associative array, which would make it easier to read, but it's still longer. Let's try something more elegant using the combination of 4H end list. I'll start with only one variable. For each this rows as list player name. Then, as the return value, let's return ret val li and then the player name.

And close the li. Save, then go back to the browser and refresh the page. Now, I'm only seeing the player identifiers but no errors. Good so far. Let's populate the rest of it. Going back to the IDE, assign logical variable names to the list, so player name followed by the action, the card, underscore text, and the target player name. Then, I'll modify the original snippet and pass two string, the player name, the action, card text, and target player name, save, and go back to the browser and refresh. This time, the entire human readable log entry is shown. Something to keep in mind: this technique will cause a problem if you have too many variables and not enough data.

Back to Log, I'm going to intentionally add one additional variable called Too Many. Save, then Refresh. As there's not enough elements, a notice will be thrown for the undefined offset. I'm going to fix the log now and remove that, and Save. To review, PHP 5.5 now allows me to combine 4H with List to populate variables from an array or an object that can be iterated like an array.

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PHP 5.5 First Look

14 video lessons · 3654 viewers

Jon Peck
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