PHP Array Interview Questions

PHP Array Interview Questions

Here is the list of top  PHP array interview questions that can be asked by Interviewer in PHP Interviews to Freshers and Experience.

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Below are the list of Best PHP Array Interview Questions and Answers

PHP Array is a special type of variable that stores multiple values in a single variable. There are 3 types of array available in PHP they are

  • Indexed arrays
  • Associative arrays
  • Multidimensional arrays

It is very easy to create an array in PHP. You can create an array in PHP using array() function or simply assigning [] in front of variable.

$array1=array() or $array1=[];

You can use count() function to count the number of elements in a PHP Array.

$array=['ram','ravi','ajay','vijay'];
echo count($array); // outputs 4

PHP array_key_exists() Function is used to check a key exist or not in an array.

Example Uses

<?php
$a=array("fruit"=>"Apple","Car"=>"BMW");
if (array_key_exists("Apple",$a))
  {
  echo "Array Key exists!";
  }
else
  {
  echo "Array Key does not exist!";
  }
?>

PHP explode() function is used to create an array from a string in PHP. Explode function breaks a string using a delimiter into an array.

Below is the basic syntax to convert a string to an array in PHP

<?php
$string = "This is a string in PHP";
$php_array= explode(" ",$string);
print_r(" ",$php_array);
?>

You can use array_splice() or unset() function to delete an element from PHP array.

There are basically three types of arrays available in PHP. They are:

  • Indexed arrays
  • Associative arrays
  • Multidimensional arrays

array_rand() function is used to get random value from PHP array.

Usage

&lt?php
$a=array("apple","banana","grapes","mango","orange");
echo $random_value=array_rand($a);
?>