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)?

0

8 Answers

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);
?>

13

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';

5

Based on my experience, solution which is fine(the best) when keys are not important:

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

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);

$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>";

1

REMEMBER, this method overwrites first array, so use only when you are sure!

$arr1 = $arr1 + $arr2;

(see source)

2

$products_arr["passenger_details"]=array();
array_push($products_arr["passenger_details"],array("Name"=>"Isuru Eshan","E-Mail"=>""));
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>";
}

When one wants elements to be added with zero-based element indexing, I guess this will work as well:

// 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';

0

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