php is the most important programming language
padmanabanm47
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66 slides
May 27, 2024
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About This Presentation
Ph0
Slide Content
PHP: Hypertext Preprocessor PHP is a server scripting language, and a powerful tool for making dynamic and interactive Web pages. PHP is a widely-used, free, and efficient alternative to competitors such as Microsoft's ASP.
<?php // PHP code goes here ?>
<!DOCTYPE html> <html> <body> <h1>My first PHP page</h1> <?php echo "Hello World!"; ?> </body> </html >
PHP variables <?php $txt = "Hello world!"; $x = 5; $y = 10.5; ?>
A variable starts with the $ sign, followed by the name of the variable A variable name must start with a letter or the underscore character A variable name cannot start with a number A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive ($age and $AGE are two different variables)
<?php echo "<h2>PHP is Fun!</h2>"; echo "Hello world!<br>"; echo "I'm about to learn PHP!<br>"; echo "This ", "string ", "was ", "made ", "with multiple parameters."; ?>
<?php $txt1 = "Learn PHP"; $txt2 = " Welcome"; $x = 5; $y = 4; print "<h2>" . $txt1 "</h2>"; print "Study PHP " . $txt2 "<br>"; print $x + $y; ?>
Data types Integer Double String Boolean
<!DOCTYPE html> <html> <body> <?php echo strpos (“ jsp php jstl php ","php"); ?> </body> </html>
<?php $ str = "Hello World!\n\n"; echo $ str ; echo chop($ str ); ?>
<?php $ str = "Hello World!"; echo $ str . "<br>"; echo trim($ str,"Hed !"); ?>
Arithmetic operators Assignment operators Comparison operators Increment/Decrement operators Logical operators
If.. elseif ..else <!DOCTYPE html> <html> <body> <?php $t = date("H"); echo "<p>The hour (of the server) is " . $t; echo ", and will give the following message:</p>"; if ($t < "10") { echo "Have a good morning!"; } elseif ($t < "20") { echo "Have a good day!"; } else { echo "Have a good night!"; } ?> </body> </html>
switch <!DOCTYPE html> <html> <body> <?php $ favcolor = "red"; switch ($ favcolor ) { case "red": echo "Your favorite color is red!"; break; case "blue": echo "Your favorite color is blue!"; break; case "green": echo "Your favorite color is green!"; break; default: echo "Your favorite color is neither red, blue, nor green!"; } ?> </body> </html>
while <!DOCTYPE html> <html> <body> <?php $x = 0; while($x <= 100) { echo "The number is: $x <br>"; $x+=10; } ?> </body> </html>
Do…while <!DOCTYPE html> <html> <body> <?php $x = 1; do { echo "The number is: $x <br>"; $x++; } while ($x <= 5); ?> </body> </html>
For loop <!DOCTYPE html> <html> <body> <?php for ($x = 0; $x <= 10; $x++) { echo "The number is: $x <br>"; } ?> </body> </html>
foreach <!DOCTYPE html> <html> <body> <?php $colors = array("red", "green", "blue", "yellow"); foreach ($colors as $value) { echo "$value <br>"; } ?> </body> </html>
Regular Expression ereg - it recognizes Portable Operating system Interface extended regular expression(POSIX) preg - Perl compatible regular expressions(PCRE)
Regular Expression <!DOCTYPE html> <html> <body> <?php $ str = "Visit College"; $pattern = "/college/ i "; echo preg_match ($pattern, $ str ); ?> </body> </html>
<!DOCTYPE html> <html> <body> <?php $ str = "Visit College"; $pattern = "/college/ i "; echo preg_match ($pattern, $ str ); ?> </body> </html>
<!DOCTYPE html> <html> <body> <?php $ str = "Visit Microsoft!"; $pattern = "/ microsoft / i "; echo preg_replace ($pattern, “sun", $ str ); ?> </body> </html>
Regular expression example
In PHP form data values are directly available as implicit variables whose names match the names of the corresponding form elements. This is know as implicit access Many web servers not allow this, because of security problem Implicit arrays – these have keys that match the form element names and values that were input by the clients $_POST[],$_GET[]
A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values.
A cookie is created with the setcookie() function . $_COOKIE SESSION COOKIE PERSISTENT COOKIE
<!DOCTYPE html> <?php $cookie_name = "user"; $cookie_value = "John Doe"; setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day ?> <html> <body> <?php if(!isset($_COOKIE[$cookie_name])) { echo "Cookie named '" . $cookie_name . "' is not set!"; } else { echo "Cookie '" . $cookie_name . "' is set!<br>"; echo "Value is: " . $_COOKIE[$cookie_value]; } ?> <p><strong>Note:</strong> You might have to reload the page to see the value of the cookie.</p> </body> </html>
Delete cookie <!DOCTYPE html> <?php // set the expiration date to one hour ago setcookie("user", "", time() - 3600); ?> <html> <body> <?php echo "Cookie 'user' is deleted."; ?> </body> </html>
Enabled or not <!DOCTYPE html> <?php setcookie(" test_cookie ", "test", time() + 3600, '/'); ?> <html> <body> <?php if(count($_COOKIE) > 0) { echo "Cookies are enabled."; } else { echo "Cookies are disabled."; } ?> </body> </html>
Mysql connect <?php $ servername = " localhost "; $username = "username"; $password = "password"; $ dbname = " myDB "; // Create connection $ conn = new mysqli ($ servername , $username, $password, $ dbname ); // Check connection if ($ conn -> connect_error ) { die("Connection failed: " . $ conn -> connect_error ); } // sql to create table $ sql = "CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50), reg_date TIMESTAMP )"; if ($ conn ->query($ sql ) === TRUE) { echo "Table MyGuests created successfully"; } else { echo "Error creating table: " . $ conn ->error; } $ conn ->close(); ?>
<?php $ servername = " localhost "; $username = "username"; $password = "password"; $ dbname = " myDB "; // Create connection $ conn = new mysqli ($ servername , $username, $password, $ dbname ); // Check connection if ($ conn -> connect_error ) { die("Connection failed: " . $ conn -> connect_error ); } $ 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; } $ conn ->close(); ?>
<?php $ servername = " localhost "; $username = "username"; $password = "password"; $ dbname = " myDB "; // Create connection $ conn = new mysqli ($ servername , $username, $password, $ dbname ); // Check connection if ($ conn -> connect_error ) { die("Connection failed: " . $ conn -> connect_error ); } $ sql = "SELECT id, firstname , lastname FROM MyGuests "; $result = $ conn ->query($ sql ); if ($result-> num_rows > 0) { // output data of each row while($row = $result-> fetch_assoc ()) { echo "id: " . $row["id"]. " - Name: " . $row[" firstname "]. " " . $row[" lastname "]. "<br>"; } } else { echo "0 results"; } $ conn ->close(); ?>
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