php array example

Example 1: common array methods php

sizeof($arr) //returns the size of elements in the array
is_array($arr) // returns true if $arr is an array and false otherwise
in_array($var, $arr) // check if $var is in the array $arr
print_r($arr) // prints the complete representation of the array
array_merge($arr1, $arr2) //combines $arr1 and $arr2 into a single array
array_values($arr) //store all the values into a new array without the keys but only the values
array_keys($arr) // returns only the keys inside an array
array_pop($arr) // removes the last element of  the array
array_push($arr, $val) // pushes $val to the end of array
array_shift($arr) // removes the first element in the array $arr
sort($arr) // sorts an array in an ascending order

/*Other sorting methods are:
-asort()
-arsort()
-ksort()
-krsort()
-rsort()
*/

array_map('function_name', $arr) // passes each value in the array inside the fuction and do the operation on the array data
array_flip($arr) //This function interchange the keys and the values of a PHP associative array.
array_reverse($arr) //This function is used to reverse the order of elements
array_rand($arr) //randomly pick an element from the array
array_slice($arr, $offset, $length)//This function is used to create a subset of any array

Example 2: php arrays

#Arrays

<?php
    #array is a variable that holds multiple values
    /*
    Three types of arrays
        - Indexed
        - associative
        - Multi-dimensional
    */
    // Indexed array is the most common and easiest
    $people = array('Kevin', 'Jeremy ', 'Sara');
    $ids = array(23, 55, 12);
    $cars = ['Honda', ' Toyota', 'Ford'];  // also an array
    //add to an array
    $cars[3] = ' Audi';
    // you can use empty brackets and it will be added to the last one
    $cars[] = ' Chevy';

    echo $people[1];
    echo $ids[1];
    echo $cars[1];    
    echo $cars[3];
    echo $cars[4];
    echo count($cars);
    //you can also print the entire array
    print_r($cars);
    //to look at data type
    echo var_dump($cars);

    //Associative Arrays key pairs
    $people1 = array('Kevin' => 35, 'Jeremy' => 23, 'Sara' => 19);
    $ids1 = array(23 => 'Kevin', 55 => 'Jeremy', 12 => 'Sara');
    echo $people1['Kevin'];
    echo $ids1[23];
    //add to these types of arrays
    $people1['Jill'] = 44;
    echo $people1['Jill'];
    print_r($people1);
    var_dump($people1);

    //Multi-Dimensional Arrays aka an array within an array
 
    $cars2 = array(
        array('Honda',20,10),
        array('Toyota',30,20),
        array('Ford',23,12)
    );

    echo $cars2[1][0];

    
?>

Example 3: array php

<?php
$array = array(
    "foo" => "bar",
    "bar" => "foo",
);

// as of PHP 5.4
$array = [
    "foo" => "bar",
    "bar" => "foo",
];
?>

Example 4: php array

<?php
$array = array(
    "foo" => "bar",
    42    => 24,
    "multi" => array(
         "dimensional" => array(
             "array" => "foo"
         )
    )
);

var_dump($array["foo"]);
var_dump($array[42]);
var_dump($array["multi"]["dimensional"]["array"]);
?>

Example 5: php array

<?php
$array = array("foo", "bar", "hello", "world");
var_dump($array);
?>

Example 6: array in php

<?php

$cars = array("Maserati", "Porsche", "BMW");

echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";

?>