PHP 7.4
# Use PHP 7.4 AddHandler application/x-httpd-php74 .php
PHP 8.0
# Use PHP 8.0 AddHandler application/x-httpd-php80 .php
PHP 8.3
# Use PHP 8.3 AddHandler application/x-httpd-php83 .php
Prevent direct access to a file
Method 1
<Files "example.txt">
Deny from all
</Files>
Method 2
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/example.txt$
RewriteRule .* /error-page.html [L]
Redirect url
Method 1
Redirect 301 /oldpage.html http://example.com/newpage.html
Method 2
RewriteEngine On RewriteRule ^oldpage.html$ http://example.com/newpage.html [R=301,L]
Add a variable to a string
Method 1
<?php $name = "John"; $string = "Hello, " . $name . "!"; echo $string; ?>
Method 2
<?php $name = "John"; $string = "Hello, $name!"; echo $string; ?>
Add elements to an array
$array[] = $value
<?php $array = array(); $array[] = "element1"; $array[] = "element2"; $array[] = "element3"; print_r($array); ?>
array_push()
<?php $array = array(); array_push($array, "element1"); array_push($array, "element2"); array_push($array, "element3"); print_r($array); ?>
Connect to mysql database
MySQLi
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$database = "database_name";
$conn = new mysqli($servername, $username, $password, $database);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
?>
PDO
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$database = "database_name";
try {
$conn = new PDO("mysql:host=$servername;dbname=$database", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected successfully";
} catch(PDOException $e) {
echo "Connection failed: " . $e->getMessage();
}
?>
Redirect to another page
<?php
header("Location: https://www.example.com/newpage.php");
exit;
?>