Php
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This document provides an overview of basic PHP concepts including variables, data types, constants, arrays, conditional statements, loops, connecting to databases, and performing basic CRUD operations. Key points covered include variable naming conventions, escape sequences, defining constants, looping with while, and connecting to MySQL to insert, delete, and update data.
![<?php
$cars = array("Volvo", "BMW", "Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " .
$cars[2] . ".";
?>](https://image.slidesharecdn.com/php-220311034600/85/Php-9-320.jpg)
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Php
- 1. dfdfd
- 4. multiline
- 5. $txt = "Hello world!"; $x = 5; $y = 10.5; echo $txt; Echo $Txt; * Variable name must begin with a letter or a underscore( must not use numeric)
- 6. n is replaced by the newline character t is replaced by the tab character $ is replaced by the dollar sign itself ($) " is replaced by a single double-quote (") is replaced by a single backslash ()
- 8. අගය නනොනෙනස්ෙ පෙතී. <?php define("MINSIZE", 50); echo MINSIZE; echo constant("MINSIZE"); // same thing as the previous line ?>
- 9. <?php $cars = array("Volvo", "BMW", "Toyota"); echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . "."; ?>
- 10. Syntax if (condition) { code to be executed if condition is true; } else { code to be executed if condition is false; }
- 11. Example <?php $t = 1000; if ($t < 500) { echo “Small one"; } else { echo “Big one"; } ?>
- 12. while (condition is true) { code to be executed; } <?php $x = 1; while($x <= 5) { echo "The number is: $x <br>"; $x++; } ?>
- 13. <?php $x = 0; while($x < 10) { if ($x == 4) { break; } echo "The number is: $x <br>"; $x++; } ?>
- 14. Login using your root (user) From the main menu choose Databases In the create database field type in a name for your database
- 15. Click on Users in the main menu. Choose the Add User option. In the section Login Information - type in a username, localhost and a password
- 16. GLOBAL privileges apply to ALL databases on the server ( leave this section BLANK) Then click the Add User button Click Edit Privileges to assign access to a specific database of created user
- 17. <?php $servername = "localhost"; $username = "username"; $password = "password"; // Create connection $conn = new mysqli($servername, $username, $password); // Check connection if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } echo "Connected successfully"; ?>
- 19. $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', '[email protected]')"; if ($conn->query($sql) === TRUE) { echo "New record created successfully"; } else { echo "Error: " . $sql . "<br>" . $conn->error; }
- 20. $sql = "DELETE FROM MyGuests WHERE id=3"; if ($conn->query($sql) === TRUE) { echo "Record deleted successfully"; } else { echo "Error deleting record: " . $conn->error; }
- 21. $sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2"; if ($conn->query($sql) === TRUE) { echo "Record updated successfully"; } else { echo "Error updating record: " . $conn- >error; }