PHP Array
- An array is a collection of similar data elements stored at contiguous memory locations
- An array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more.
- An array is a special variable, which can hold more than one value at a time.
<?php
$cityName = array('Delhi', 'Mumbai', 'Kolkata');
echo 'I like ' . $cars[0] . ', ' . $cars[1] . ' and ' . $cars[2] ;
?>
output:
Array
(
[0] => ra
[1] => one
[2] => game
)
In PHP, there are three types of arrays:
- Indexed arrays - Arrays with a numeric index.
- Associative arrays - Arrays with named keys.
- Multidimensional arrays - Arrays containing one or more arrays.
PHP Indexed Arrays
There are two ways to create indexed arrays:
<?php
// manually create index.
$arr[0] = 'ra';
$arr[1] = 'one';
$arr[2] = 'game';
//to looking out put of array then use print_r() or var_dump() function.
//if required formatted output then use
print_r($arr);
?>
output
Array
(
[0] => ra
[1] => one
[2] => game
)
PHP Associative Arrays
<?php
$age = array('Ram'=>35, 'Shyam'=>37, 'Ravi'=>43);
print_r($age);
echo 'Ram age is: '.$age['Ram'];
?>
output
Array ( [Ram] => 35 [Shyam] => 37 [Ravi] => 43 )
Ram age is: 35PHP Multidimensional Arrays
A multidimensional array is an array containing one or more arrays.
<?php
$cars = array (
array("Volvo",22,18),
array("BMW",15,13),
array("Saab",5,2),
array("Land Rover",17,15)
);
print_r($cars);
var_dump($cars);
?>
output
Array
(
[0] => Array
(
[0] => Volvo
[1] => 22
[2] => 18
)
[1] => Array
(
[0] => BMW
[1] => 15
[2] => 13
)
[2] => Array
(
[0] => Saab
[1] => 5
[2] => 2
)
[3] => Array
(
[0] => Land Rover
[1] => 17
[2] => 15
)
)
array(4) {
[0]=>
array(3) {
[0]=>
string(5) "Volvo"
[1]=>
int(22)
[2]=>
int(18)
}
[1]=>
array(3) {
[0]=>
string(3) "BMW"
[1]=>
int(15)
[2]=>
int(13)
}
[2]=>
array(3) {
[0]=>
string(4) "Saab"
[1]=>
int(5)
[2]=>
int(2)
}
[3]=>
array(3) {
[0]=>
string(10) "Land Rover"
[1]=>
int(17)
[2]=>
int(15)
}
}
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