How to Filter Items of a Set based on a Condition in PHP - Step by Step Examples

How to Filter Items of a Set based on a Condition in PHP ?

Answer

To filter items of a set based on a condition in PHP, you can iterate through the set and selectively add items that satisfy the condition to a new set.


✐ Examples

1 Filter Even Numbers from a Set

In this example,

  1. First, we create a set of integers named $numberSet with values [1, 2, 3, 4, 5, 6].
  2. Next, we create a new set called $evenNumbers.
  3. We iterate through each element of $numberSet using a foreach loop.
  4. Within the loop, we check if the current number is even using the modulo operator %.
  5. If the number is even, we add it to the $evenNumbers set.

PHP Program

<?php 
$numberSet = [1, 2, 3, 4, 5, 6];
$evenNumbers = [];
foreach ($numberSet as $num) {
    if ($num % 2 === 0) {
        $evenNumbers[] = $num;
    }
}
print_r($evenNumbers);
?>

Output

[2, 4, 6]

2 Filter Strings Starting with 'A' from a Set

In this example,

  1. First, we create a set of strings named $stringSet with values ["Apple", "Banana", "Apricot", "Orange"].
  2. Next, we create a new set called $filteredStrings.
  3. We iterate through each element of $stringSet using a foreach loop.
  4. Within the loop, we check if the current string starts with 'A' using the strpos() function.
  5. If the string starts with 'A', we add it to the $filteredStrings set.

PHP Program

<?php 
$stringSet = ["Apple", "Banana", "Apricot", "Orange"];
$filteredStrings = [];
foreach ($stringSet as $str) {
    if (strpos($str, 'A') === 0) {
        $filteredStrings[] = $str;
    }
}
print_r($filteredStrings);
?>

Output

["Apple", "Apricot"]

Summary

In this tutorial, we learned How to Filter Items of a Set based on a Condition in PHP language with well detailed examples.


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