如何在PHP中向空数组添加元素？

PHP中的数组是否有添加方法,例如,cart.add(13)？

两者array_push和你描述的方法都有效.

$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[] = $i;  
}
echo "
";
print_r($cart);
echo "
";

是相同的:

最好不要使用array_push,只使用你的建议.这些功能只会增加开销.

//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,当密钥不重要时,解决方案很好(最好):

$cart = [];
$cart[] = 13;
$cart[] = "foo";
$cart[] = obj;

你可以使用array_push.它将元素添加到数组的末尾,就像在堆栈中一样.

你也可以这样做:

$cart = array(13, "foo", $obj);