PHP Array Exercises : Get the index of the highest value in an associative array

Last update on May 30 2025 13:14:00 (UTC/GMT +8 hours)

31. Get Index of Highest Value in Associative Array

Write a PHP program to get the index of the highest value in an associative array.

Sample Solution:

PHP Code:

<?php
// Define an associative array $x with key-value pairs
$x = array(
    'value1' => 3021,
    'value2' => 2365,
    'value3' => 5215,
    'value4' => 5214,
    'value5' => 2145);

// Reset the internal pointer of the array to the first element (optional step)
reset($x);

// Sort the array in descending order based on values, preserving keys
arsort($x);

// Get the key of the maximum (first) value in the sorted array
$key_of_max = key($x);

// Display the index (key) of the highest value in the original array
echo "Index of the highest value : " . $key_of_max . "\n";

?>

Output:

Index of the highest value : value3

Flowchart:

For more Practice: Solve these Related Problems:

• Write a PHP script to traverse an associative array and output the key corresponding to the maximum value.
• Write a PHP function to identify and return the index of the highest value in an associative array using a custom comparison.
• Write a PHP program to sort an associative array by values and then retrieve the key of the top element.
• Write a PHP script to implement a loop that compares values in an associative array and tracks the key of the maximum entry.

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PHP Code Editor:

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