Intelligent people can throw a question how do you choose a particular value from a set of value. In the above example, the array is same as the set of fruits known as apple, banana, pineapple and grape. So, how would someone derive a set of particular fruits supposes the name of apple from this array?

PHP data types move beyond strings, numbers and Booleans. It supports arrays. With it you can play with the code and add variable functions while keeping the same length of PHP coding. There are some advanced arrays functions within PHP which let users to manipulate the values they hold. Strings, numbers and Booleans are examples of variables which hold a single value. Array are variables but different from the rest of variables.

It would hold more than one value. 

While writing coding for logical side of database, variables array holds significant positions as it would hold the names of multiple values such as a set of fruit name, an entire category, achieve page or tag page. Category, tag and archive hold multiple values but find similar characteristics among them in order to find a greater degree of similarity. Array variables are special and hold a significant position in the minds of coder. 

Inside PHP coding defining of array variables would become a value of a set of similarly grouped elements when it requires it removes unnecessary clutters from within PHP coding parameters. 

// define array

$fruits = array('apple', 'banana', 'pineapple', 'grape');

?>

This PHP code template is simple to understand. 

?> is ending of PHP code. 

$fruits = array('apple', 'banana', 'pineapple', 'grape'); 

Here array is a variable that holds name of the setting of fruits.  Within brackets names of fruits are mentioned in detail. It is then followed by a semicolon which signifies end of that statement. From this example, it is aptly clear that array variable is completely different from the other set of variables. Most of traditional variables hold only single value. Array holds multiple values as mentioned and shown in the above example. 

It is simple as a variable array uses an index number to choose a particular value. Here, suppose the first value or apple has index number zero, followed by banana has index number one, then pineapple has index number two, then grape has index number three. Thus to access value of apple one has to call the value zeroes from this particular array. 

So, the code to call apple from the fruit array would be: 

// define array

$fruits[0] = array('apple', 'banana', 'pineapple', 'grape');

?>

While creating large chunk of array many a times it would become a strange case of misconception while putting the numbers as values of array. Then comes the concept of associate arrays where index numbers come from user-defined strings. These user-defined strings are called as keys and mostly they are the first English letter of the name of values. It helps the programmer to recall the names of array easily and put it within preview of notation where defilement of array begins. 

// define array

$fruits = array(

'a' => 'apple',

'b' => 'banana',

'p' => 'pineapple',

'g' => 'grape'

);

?>

In the above example, user-defined strings or keys are used to name the arrays. Here, a are used for the apple and then b is used for banana and so on. These types of arrays are known as associate arrays. Here key of an array must be unique and never ever be supplemented for other arrays. Expression of relationships between keys and arrays is defined with => in PHP programming. 

Variables are named for a real entity. In the above example name of variable are fruits. It is a well known name. A dollar ($) signs before name of variable signifies existence of variable within PHP programming. Name of variable must begin with a letter and with mostly caps lock off a letter or an underscore character. Array variable does not represent with a punctuation mark of with spaces. 

Now names of variable of array ($fruits) are clearly defined. Second stage is to assign values to variables. Here, is an example of standard number indexed array. 

// define array

$fruits = array('apple', 'banana', 'pineapple', 'grape');

?>

Some instances users would be blinded by the notion of assigning specific keys or values to variables of arrays. Then there is a way out, where PHP program would automatically assign values to variables. Just write the code of variable in this way in order to prepare an automatic ground for PHP program to assign specific values to variables. 

// define array

$fruits[]  =  ‘apple’ ;

$fruits[]   =  ‘banana’ ;

$fruits[]  =  'pineapple' ;

$fruits[]  =  ‘grape’;

?>

In this way, with addition of empty square braces after variable name, PHP programming reads it from here and applies automatic suggestions of values to each name of variables. There is multiple way to index names of variables. In addition, you could use a hybrid technique to prepare the ground for a better managed array variables.

One has to remember, variable arrays hold an important position in PHP programming. One need to create a clear cut and significant instruction from within different gambit of programming otherwise clear cut confusion is stored for you while writing PHP code. 

Modifying the array value is easy. Simply, assign a new index value to each variable. It is always not good while using arrays. There are some instances of the advent of problems when by mistake some part of the array is removed. Due to optimizations or due to removal of some add on by mistakes instances of some arrays could be removed.

Then PHP will set the array element to null. Array are indexed in such way which is like a series and in order to remove this hold. Re-indexing of arrays needs to be done comprehensively. In order to unset and automatically re-index array, one need to initiate multi sort array function so that holes inside indexing notations would be passed. 

There is another workaround to remove null values from a particular set of arrays. In the latest PHP programming languages, there are some array functions which pop up unsettled array elements or array push function which easily remove an element from an array. Generally, using of array pop and array push function is safe for the entire data base to remove holes within the configuration of the database.