How to use Array in PHP
PHP is an acronym for “Hypertext Preprocessor” and it is widely used as an open-source scripting language. With the use of a PHP framework, developers can create, read, write, delete and close files on sever. Even, they can collect data by sending and receiving cookies. Developers can run PHP language on various platforms which involve Windows, Linux, Mac OS X, etc. Moreover, PHP is compatible with almost all servers that have been used today such as Apache, IIS, etc. In PHP a wider number of array functions are used to advance the functional features of the PHP framework. An array is basically a data structure that is used to store one or more values in a single value. In this article, various PHP interview questions are discussed which will help you to crack PHP interviews. It is important for the candidate to have proper knowledge about PHP array function because this is the major module of the PHP framework which reduces the complexity of the framework.
Introduction to PHP array
An array is assigned to a single variable, but it can hold dozens of individual pieces of information. Each individual bit of information or row is referred to as an array element. Moreover, within every array element, there are two parts: the value which contains the actual information that the developer wants to store; a unique key that identifies the value. The keys are either be non-negative integers or strings. Array with integers as keys are the most common type and known as Scalar Arrays. Those with key as string are known as Associative Array.
Types of Array
There are three types of the array in PHP framework namely:
1. Numeric array:
Developers can create only elements; ID will be automatically assigned to each and every element which is present in the array. In other word, a numeric array is a data structure which is also termed as “an array which underpinned numeric index”. The values stored in the numeric array can be accessed and stored in a well-oriented liner fashion.
For example-
<?php
$a = array (“train”, “car”, “bus”);
print_r($a);
?>
Output: Array ([0] =train, [1] = Car, [2] =bus)
2. Associative array
An associative array developer needs to create elements with a unique ID. This type of array is used to store value pairs. In general, associative develop should need to assign value to the keys which are associated with the variable. Likewise, an associative array is transformed into dynamic objects and it losses the methods and functions of the array.
For example
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<?php
$a= array (“6” => “train”, “7” =>” car”, “8” =>” bus”)
print_r($a);
?>
Output
Array ([6] = train, [7] =car, [8] = bus)
3. Multidimensional array
A multidimensional array is also known as a two-dimensional array. A multidimensional array is an array of arrays i.e. each element in the main array can also be an array and each element in the sub-array can be an array and so on. A multidimensional array is an array of arrays, which means that the array can contain arrays itself if an array element value is another array then this is a multidimensional array.
For example
<?php
$a=array (“a”, “b” => array (“train”, “car”), “bus”);
print_r($a);
?>
Output
Array ([0] = a [b]=array ([0] = train [1] =car) [1] =bus)
Conclusion
In this article, we have collected and selected the Most Frequently asked Best interview questions which will help to crack the interviews. Go through all the basic concepts of arrays of PHP you will increase your chances of success in the interview. You will be clarifying the concept of the array and its function in PHP as each type of array is justified by providing examples cases.
