What is the significance of $key => $value in PHP?

In PHP, $key => $value is a way to iterate over an associative array where $key represents the key of the array element and $value represents the corresponding value. This is commonly used in loops to access and manipulate key-value pairs in an array. Example: 

// Iterate over an associative array using $key => $value
$fruits = array("apple" => "red", "banana" => "yellow", "grape" => "purple");

foreach($fruits as $key => $value) {
    echo "The color of " . $key . " is " . $value . "<br>";
}

Keywords

associative array key-value pair PHP syntax data structure array manipulation

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