How to add elements to an empty array in PHP?
If I define an array in PHP such as (I don't define its size):
$cart = array();
Do I simply add elements to it using the following?
$cart[] = 13;
$cart[] = "foo";
$cart[] = obj;
Don't arrays in PHP have an add method, for example, cart.add(13) ?
Both array_push and the method you described will work.
<?php
$cart = array();
$cart[] = 13;
$cart[] = 14;
// etc
?>
Is the same as:
<?php
$cart = array();
array_push($cart, 13);
array_push($cart, 14);
// Or
$cart = array();
array_push($cart, 13, 14);
?>
It's better to not use array_push and just use what you suggested. The functions just add overhead.
//We don't need to define the array, but in many cases it's the best solution.
$cart = array();
//Automatic new integer key higher than the highest
//existing integer key in the array, starts at 0.
$cart[] = 13;
$cart[] = 'text';
//Numeric key
$cart[4] = $object;
//Text key (assoc)
$cart['key'] = 'test';
根据我的经验，当钥匙不重要时，您的解决方案很好（最好）：
$cart = [];
$cart[] = 13;
$cart[] = "foo";
$cart[] = obj;
下一篇: 如何将元素添加到PHP中的空数组？