PHP Array Interview Questions and Answers

What Is PHP?
PHP stands for “Hypertext Pre-processors”. It is server side scripting language and used for developing web applications and It's allows us to dynamically create generated web pages.

PHP has many frameworks and CMS and used for creating websites.  The PHP is very easy to create sites using its CMS. 

The PHP is an Object Oriented Programming (OOPs) language.

What Is an Array in PHP?
List Types of Array Are Available in PHP?

The PHP Array is special types of variable which stores multiple values in a single variable.
There are three types of array available i.e.
1.      Indexed Arrays
2.      Associative Arrays
3.      Multidimensional Arrays

How To Create an Empty Array in PHP?
Creating an empty array is very easy in PHP and we can create an array using array() function or simply using assigning [] in the front of variable in PHP.

The Example is:


How To Get Number of Elements in an Array?
We can use count () function to count the number of elements in a PHP Array.

The Example is:
$array=['Anil', 'Sunil', 'Sushil', 'Aradhya', 'Reena'];

echo count($array); // The output is – 5

How To Get a Random Value from a PHP Array?
PHP array_rand() function is used to returns a random key from an array. If you specify that the function should return more than one key.

As of PHP 5.2.10, the resulting array of keys is no longer shuffled.

Syntax -

The Example is:
    $ary=array("Anil", "Sunil", "Sudhil", "Aradhya", "Reena");
    $random_keys=array_rand($ary, 4);

    echo $ary[$random_keys[0]]."<br/>";
    echo $ary[$random_keys[1]]."<br/>";
    echo $ary[$random_keys[2]]."<br/>";
    echo $ary[$random_keys[3]];

How To Remove Specific Element from an Array?
The PHP array_search() function is used to get the first matching key of the given value and then you can delete it with unset().

The example is:
if (false !== $key = array_search(401, $array)) {

What Is the Best Way To Delete Array Item in PHP?
Generally unset () function is safe for hashtables, but if you have to rely on continous numeric indexes you'll have to use either array_splice() or a combination of unset() and array_values().

The Example is –
$a1 = array('a' => 1, 'b' => 2, 'c' => 3);
// array('a' => 1, 'c' => 3)

$a2 = array(1, 2, 3);
// array(0 => 1, 2 => 3)
// note the missing index 1

// solution 1 for numeric arrays
$a3 = array(1, 2, 3);
array_splice($a3, 1, 1);
// array(0 => 1, 1 => 3)
// index is now continous

// solution 2 for numeric arrays
$a4 = array(1, 2, 3);
$a4 = array_values($a4);
// array(0 => 1, 1 => 3)
// index is now continous


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