Question

如果我在PHP中定义一个数组，例如（我没有定义它的大小）：

$cart = array();

我是否只需使用以下内容添加元素？

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

PHP中的数组是否有add方法，例如cart.add(13)？

Answer 1

array_push和您描述的方法都有效。

$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[] = $i;  
}
echo "<pre>";
print_r($cart);
echo "</pre>";

与：

相同

<?php
$cart = array();
array_push($cart, 13);
array_push($cart, 14);

// Or 
$cart = array();
array_push($cart, 13, 14);
?>

Answer 2

最好不要使用array_push，只使用您的建议。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';

Answer 3

根据我的经验，当密钥不重要时，解决方案很好（最好）：

Task    task(Map<String,?> args, String name)

Task    task(Map<String,?> args, String name, Closure configureClosure)

Task    task(String name)

Task    task(String name, Closure configureClosure)

Answer 4

您可以使用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);

Answer 5

您的首选对我来说很好。

$cart = array();
cart[] = 1:
$cart[]   = 'foo':
$cart = 3;

Answer 6

$products_arr["passenger_details"]=array();
array_push($products_arr["passenger_details"],array("Name"=>"Isuru Eshan","E-Mail"=>"isuru.eshan@gmail.com"));
echo "<pre>";
echo json_encode($products_arr,JSON_PRETTY_PRINT);
echo "</pre>";

//OR

$countries = array();
$countries["DK"] = array("code"=>"DK","name"=>"Denmark","d_code"=>"+45");
$countries["DJ"] = array("code"=>"DJ","name"=>"Djibouti","d_code"=>"+253");
$countries["DM"] = array("code"=>"DM","name"=>"Dominica","d_code"=>"+1");
foreach ($countries as $country){
echo "<pre>";
echo print_r($country);
echo "</pre>";
}

Answer 7

$cart = array();
$cart[] = 11;
$cart[] = 15;

// etc

//Above is correct. but below one is for further understanding

$cart = array();
for($i = 0; $i <= 5; $i++){
          $cart[] = $i;  

//if you write $cart = [$i]; you will only take last $i value as first element in array.

}
echo "<pre>";
print_r($cart);
echo "</pre>";

Answer 8

当想要添加基于零的元素索引的元素时，我想这也会起作用：

// adding elements to an array with zero-based index
$matrix= array();
$matrix[count($matrix)]= 'element 1';
$matrix[count($matrix)]= 'element 2';
...
$matrix[count($matrix)]= 'element N';

Answer 9

array_push 和您描述的方法都有效。

$customArray = array();
$customArray[] = 20;
$customArray[] = 21;

以上是正确的，以下是为了进一步理解

$customArray = array();
for($i=0;$i<=12;$i++){
    $cart[] = $i;  
}
echo "<pre>";
print_r($customArray);
echo "</pre>";

Answer 10

它叫做array_push：http://il.php.net/function.array-push

如何在PHP中向空数组添加元素？

10 个答案: