How to add elements to an empty array in PHP?
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How to add elements to an empty array in PHP?
Question
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)?
2014/04/14
Accepted Answer
Both array_push and the method you described will work.
$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>";
Is the same as:
<?php
$cart = array();
array_push($cart, 13);
array_push($cart, 14);
// Or
$cart = array();
array_push($cart, 13, 14);
?>
2018/11/22
Read more… Read less…
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';
2015/07/31
Based on my experience, you solution is fine(best) when keys are not important:
$cart = [];
$cart[] = 13;
$cart[] = "foo";
$cart[] = obj;
2018/05/05
You can use array_push. It adds the elements to the end of the array, like in a stack.
You could have also done it like this:
$cart = array(13, "foo", $obj);
2009/03/24
$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>";
2019/10/23
REMEMBER, this method overwrites first array, so use only when you are sure!
$arr1 = $arr1 + $arr2;
2017/05/23
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