How to check foreach Loop Key Value in PHP ?

In PHP, the foreach loop can be used to loop over an array of elements. It can be used in many ways such as

1. To loop through a list of simple values.
2. To loop through a list of key-value pairs.

Using the foreach loop with simple values:

We can use the foreach loop to access and use the elements in an array of simple values, such as strings or numbers.

Example 1:

PHP

<?php
    $names = array("Ramesh", "Suresh", "Ram", "Shyam");
    foreach ($names as $value) {
    echo "$value <br>";
    }
?>

Output:

Ramesh
Suresh
Ram
Shyam

In the above example, each element of the array names is iterated over and is assigned to the variable value.

Example 2:

PHP

<?php
    $marks = array(45, 78, 93, 69);
    foreach ($marks as $value) {
      echo "$value <br>";
    }
?>

Output:

45
78
93
69

Using the foreach loop with Key-Value pairs:

We will use the same foreach loop to iterate over an array of key-value pairs.

Example 3: In this case, an array of students and their marks are taken in the array.

PHP

<?php
    $markSheet = array("Ramesh"=>45, "Suresh"=>78, "Ram"=>93, "Shyam"=>69);
    foreach ($markSheet as $key => $val) {
      echo "$key - $val<br>";
    }
?>

Output:

Ramesh - 45
Suresh - 78
Ram - 93
Shyam - 69

In the example above, we iterate over each array element and then extract the key-value pair into variables key and val respectively.