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array operator

You can create and manage arrays using square brackets []. [] can both create arrays and add elements to the end of an array.

Syntax for array operator []

Array operator has the following syntax.

$arratName[] = "new Value";

$arratName[index] = "new Value";

$arratName["key"] = "new Value";

$arratName[index]; // get value by index

$arratName["key"]; // get value by key

Example to use PHP Array Operator

			$array[] = "php"; 
			$array[] = "mysql"; 
			$array[] = "android"; 

Example - Create Associative Arrays with Array Operator

			$array["a"] = "php"; 
			$array["b"] = "mysql"; 
			$array["c"] = "android"; 

PHP Access Array Element

By using array operator [] we can access elements in an array.


Access indexed array elements

			$authors = array( "Java", "PHP", "CSS", "HTML" ); 
			$myAuthor = $authors[0];      // $myAuthor contains "Java" 
			$anotherAuthor = $authors[1]; // $anotherAuthor contains "PHP" 

Access elements from associative arrays

			$myBook = array( "title" =>  "Learn PHP", 
			                 "author" =>  "studentsempire.com", 
			                 "pubYear" =>  2018 ); 

			$myTitle = $myBook["title"];    // $myTitle contains "Learn PHP from java2s.com" 
			$myAuthor = $myBook["author"];  // $myAuthor contains "Java"   

Put expression into array operator[]

We don't have to use literal values within the square brackets; you can use any expression, as long as it evaluates to an integer or string.

			$authors = array( "Java", "PHP", "CSS", "HTML" ); 
			$pos = 2; 
			echo $authors[$pos + 1]; // Displays "HTML"   

PHP Change Array Element

We can change values using the same techniques, [].

			$authors = array( "Java", "PHP", "CSS", "HTML" ); 
			$authors[2] = "Python";   

Add to the last element

			$authors = array( "Java", "PHP", "CSS", "HTML" ); 
			$authors[4] = "Ruby";   

Append to the array end

There's an even easier way to add a new element to an array - simply use square brackets with no index:

			$authors = array( "Java", "PHP", "CSS", "HTML" ); 
			$authors[] = "Ruby";   

When you do this, PHP knows that you want to add a new element to the end of the array, and it automatically assigns the next available index to the element.

PHP Create Array using Square Bracket

The following three examples all produce exactly the same array:

Creating an array using the array() construct

$authors1 = array( "Java", "PHP", "CSS", "HTML" );

Creating the same array using [] and numeric indices

		  	$authors2[0] = "Java"; 
			$authors2[1] = "PHP"; 
			$authors2[2] = "CSS"; 
			$authors2[3] = "HTML"; 

clear array first and then create array using square bracket

Since the square bracket can also append value to the end of an array. We can avoid append value to the existing array by clear the existing array first with array() function.

$authors = array();

This creates an array with no elements (an empty array). We can then go ahead and add elements later:

		  	$authors[] = "Java"; 
			$authors[] = "PHP"; 
			$authors[] = "CSS"; 
			$authors[] = "HTML";

create associative array using square bracket

Add and change elements of associative arrays using square bracket syntax. Here an associative array is populated in two ways: first using the array() construct, and second using the square bracket syntax:

		  	// Creating an associative array using the array() construct 
			$myBook = array( "title" =>  "Learn PHP", 
			                "author" =>  "studentsempire.com", 
			                "pubYear" =>  2018 ); 

			// Creating the same array using [] syntax 
			$myBook = array(); 
			$myBook["title"] = "Learn PHP"; 
			$myBook["author"] = "studentsempire.com"; 
			$myBook["pubYear"] = 2018;

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