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Q:

Using an Array of values with a Match Expression in PHP

Hey everyone,

I hope you're doing well. I have a question about using an array of values with a match expression in PHP. I've been working on a project where I need to match different values based on specific cases. Initially, I was using a series of if-elseif statements, but I recently learned about the match expression in PHP 8 which seems much cleaner and more efficient.

However, I'm struggling a bit with understanding how to use an array of values with the match expression. From my understanding, the match expression compares a value against a series of patterns, and when a match is found, it executes the corresponding code block.

I have an array called $values which contains different values. Let's say it looks like this:

```
$values = [10, 20, 30, 40];
```

Now, I want to use the match expression to compare a variable called $testValue with the values in the $values array. If $testValue matches any of the values in the array, I want to execute a specific code block related to that match.

Here's the code I currently have:

```
$testValue = 30;

match ($testValue) {
// I'm not sure how to handle the array of values here
}
```

My question is, how can I include the array of values in the match expression? Do I need to loop through the array and check each value individually, or is there a more concise way to achieve this?

I would greatly appreciate any advice or examples you can provide to help me understand how to use an array of values with the match expression in PHP.

Thank you in advance!

All Replies

retha96

Hey everyone,

I thought I'd share my personal experience with matching an array of values using the match expression in PHP. It's an exciting feature that I've recently started using in my projects.

In a similar scenario, instead of utilizing `in_array()` or `array_search()`, I took advantage of array key matching within the match expression. Here's an example:

php
$values = [10, 20, 30, 40];
$testValue = 30;

match (true) {
array_key_exists($testValue, array_flip($values)) => {
echo "Match found!";
// Additional code related to the match
},
default => {
echo "No match found.";
// Code to handle the default case
}
}


To achieve this, I used the `array_flip()` function to interchange the keys and values of the `$values` array. Then, with `array_key_exists()`, I checked if the `$testValue` is a key within the flipped array. If it matches, the associated code block executes. Otherwise, it falls back to the default case.

What I find beneficial about this approach is that it allows me to quickly determine if a value exists in the array, and it eliminates the need for additional function calls or loops.

Feel free to give this method a try and see if it fits your requirements. Let me know if you have any further questions, and I'll be happy to assist you.

cpagac

Hey there,

I understand your question about using an array of values with a match expression in PHP. I recently started using the match expression myself, and it has really improved the readability of my code.

To answer your question, you can indeed use an array of values in the match expression. Instead of individually checking each value in a loop, you can simply pass the array as a pattern in your match expression. Here's an example based on your code:

php
$values = [10, 20, 30, 40];
$testValue = 30;

match ($testValue) {
in_array($testValue, $values) => {
echo "Match found!";
// Additional code related to the match
},
default => {
echo "No match found.";
// Code to handle the default case
}
}


In the above code, I'm using the `in_array()` function inside the match expression to check if `$testValue` exists within the `$values` array. If there's a match, it will execute the code block associated with that match. In this case, it will output "Match found!" and you can add more code within that block as needed.

If there are no matches, you can handle the default case by using the `default` keyword. In the example above, it would echo "No match found." Feel free to modify this default block to suit your specific needs.

I hope this helps! Let me know if you have any further questions.

harvey.weissnat

Hey there,

I completely agree with user 1's response about using an array of values with the match expression in PHP. It's a great feature that allows you to simplify your code and make it more readable.

In my experience, I had a similar situation where I needed to match values against an array. Instead of using `in_array()` like user 1 demonstrated, I used the arrow function syntax with the `array_search()` function. Here's an example:

php
$values = [10, 20, 30, 40];
$testValue = 30;

match (true) {
array_search($testValue, $values) !== false => {
echo "Match found!";
// Additional code related to the match
},
default => {
echo "No match found.";
// Code to handle the default case
}
}


By using `array_search()`, it returns the key of the matching value if found in the array, or false if not found. So, in the match expression, I'm checking if the result of `array_search()` is not false. If a match is found, it executes the code block associated with that match. Otherwise, it falls back to the default case.

This approach worked well for me, but it's important to note that both `in_array()` and `array_search()` have different performance implications, so choose the one that best fits your use case.

I hope this alternative approach provides you with another perspective on using an array of values with the match expression. Let me know if you have any further questions or need additional clarification.

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