how to add string to array in php code example

Example 1: php add to array

$fruits = ["apple", "banana"];
// array_push() function inserts one or more elements to the end of an array
array_push($fruits, "orange");

// If you use array_push() to add one element to the array, it's better to use
// $fruits[] = because in that way there is no overhead of calling a function.
$fruits[] = "orange";

// output: Array ( [0] => apple [1] => banana [2] => orange )

Example 2: php add to array

$cart = array();
$cart[] = 13;
$cart[] = 14;
// etc

//Above is correct. but below one is for further understanding
$cart = array();
for($i=0;$i<=5;$i++){
    $cart[] = $i;  
}
echo "<pre>";
print_r($cart);
echo "</pre>";