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Introduction to PHP
course content

Course Content

Introduction to PHP

Introduction to PHP

1. First Acquaintance
Features of the PHP LanguageFirst ApplicationComments in PHPBasic Math OperationsMath Expressions
2. Variables and Data Types
Data Types VariablesStrings BooleanComparison Operations
3. Conditional Statements
If StatementElse StatementElse If StatementSwitch-Case Statement
4. Arrays
Creating ArraysIndexesAssociative ArraysAdding and Removing Elements in Arrays
5. Loops
Loops СonceptWhile-LoopsDo-WhileFor-LoopsIncrement and Decrement

bookAdding and Removing Elements in Arrays

There are straightforward methods to add new elements to an array and remove existing ones. Let's explore these processes with examples.

Adding Elements to an Array

Adding elements to an array can be done using the [] operator to append to the end of the array or by specifying keys for new values.

Append to the end of an array:

php

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<?php
$array = []; // Initialize an empty array

// Adding elements to the end of the array
$array[] = "element 1";
$array[] = "element 2";
$array[] = "element 3";

print_r($array);
?>

In the example above, we initialize an empty array $array and then append three new lines to the end of the array using the [] operator.

Adding Elements with Specified Keys to Associative Arrays:

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<?php
$array = []; // Initialize an empty array

// Adding elements with specified keys
$array["key1"] = "value 1";
$array["key2"] = "value 2";
$array["key3"] = "value 3";

print_r($array);
?>

Here, we use strings "key1", "key2", and "key3" as keys for the values being added.

Removing Elements from an Array

To remove elements from an array in PHP, we use the unset() function for removing by index or key.

Removing by index:

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<?php
$array = ["element 1", "element 2", "element 3"];

// Removing element at index 1
unset($array[1]);

print_r($array);
?>

In this example, unset($array[1]); removes the element at index 1 (which is "element 2").

Removing by key:

php

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<?php
$array = ["key1" => "value 1", "key2" => "value 2", "key3" => "value 3"];

// Removing element with key "key2"
unset($array["key2"]);

print_r($array);
?>

Here, unset($array["key2"]); removes the element with key "key2" (which is "value 2").

Using built-in PHP functions like unset(), and array_splice() provides a convenient and efficient way to manipulate arrays dynamically. These methods are essential for managing data structures in PHP applications.

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Section 4. Chapter 4
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