To get the previous element from the current key in a PHP array, you can use a combination of array_keys() and array_search() functions. Here’s an example of how to do it:

<?php

// Sample array
$myArray = array('a' => 10, 'b' => 20, 'c' => 30, 'd' => 40);

// Current key
$currentKey = 'c';

// Get all the keys of the array
$keys = array_keys($myArray);

// Find the index of the current key
$currentKeyIndex = array_search($currentKey, $keys);

// Get the previous key by decrementing the index
$previousKeyIndex = $currentKeyIndex - 1;

// Check if the previous key index is valid
if ($previousKeyIndex >= 0) {
    // Get the previous key from the keys array
    $previousKey = $keys[$previousKeyIndex];

    // Get the previous element from the array using the previous key
    $previousElement = $myArray[$previousKey];

    echo "Previous Element: " . $previousElement;
} else {
    echo "No previous element found.";
}

?>

Output:

Previous Element: 20

In this example, we have a sample associative array $myArray, and we want to find the previous element from the current key 'c'. We first get all the keys of the array using array_keys() and then use array_search() to find the index of the current key 'c'. By decrementing this index by one, we get the index of the previous key, which is 'b'. Finally, we use this previous key to access the previous element from the array, which is 20.