PHP Array

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The array is a collection of data that store the fixed number of values of the same type.

Syntax:-

$arrayReferenceVariable = array_fill(0, $arraySize, initialValue);

Example:

if we want to store marks of 100 students, then we can create an array for it.

 <?php
// Create an array of size 5 filled with 0
$intArray = array_fill(0, 5, 0);

// Accessing elements
echo $intArray[0]; // prints 0

// Updating an element
$intArray[2] = 10;
?>

Size and type of arrays cannot change after it's declared.

Two types of Arrays:

  • One-dimensional arrays
  • Multidimensional(2D) arrays
PHP Array
Array Type Description
Single Dimensional array In this we create and initialize all the values in the single array.
Multi-Dimensional Array PHP supports the multi-dimensional array. The multi-dimensional array also called as the Two-Dimensional array.

Advantages of an array:

  • It is better to store the data of the same data type with the same size.
  • Coding is less, one variable can store a number of values.
  • It allocates memory in different memory locations for its elements. There is no memory flow or shortage of memory in arrays.
  • Iterating is faster in arrays compared to other methods like a linked list.
  • By using array data retrieving is easy.
  • Easily short the data using the swapping method.
  • By array index, we can randomly access any element from the array.
  • It supports multidimensional array.

Array Declaration in PHP

To declare an array in PHP programming language.

Syntax:-

<?php
// Define the array size
$arraySize = 5;

// Create an indexed array with default values (e.g., 0 or null)
$arrayReferenceVariable = array_fill(0, $arraySize, 0); // Fill with 0
?>

Array Initialization in PHP

An array is initialized by using the index of each element.

Syntax:-

$score = [100, 221, 59, 54];

PHP Array initialize

Example:-

<?php
$score = [100, 221, 59, 54];

for ($i = 0; $i < count($score); $i++) {
    echo "Element[" . $i . "] = " . $score[$i] . "\n";
}
?>
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