How can I convert a string to lowercase in PHP? Example code:

Listen

$string = "Hello World";

echo strtolower($string);

How can I create a file in PHP? Example code:

How can I use the is_writable function to check if a file is writable in PHP? Example code:

How can I sort an array in PHP? Example code:

How can I use the scandir function to get a list of files and directories in a directory in PHP? Example code:

How can I use the array_reverse function to reverse the order of an array in PHP? Example code:

How can I use the curl_setopt function to set options for a cURL session in PHP? Example code:

How to create drop down menu in PHP with example

How can I validate a form using PHP? Example code

How to send SMS using PHP program (full code sample included)

How can I redirect to another page in PHP? Example code:

How to code in PHP

How can I connect to a MySQL database using PHP? Example code.

How can I read a CSV file in PHP? Example code:

How can I prevent SQL injection in PHP?

How can I check if a string starts with a certain substring in PHP? Example code:

How can I use a ternary operator in PHP? Example code:

How can I use the file_put_contents function to write a string to a file in PHP? Example code:

How can I use a while loop in PHP? Example code:

How can I sort an associative array by its keys in PHP? Example code:

How can I sort an array in PHP? Example code:

How can I generate a random number in PHP? Example code

How can I use the array_unique function to remove duplicate elements from an array in PHP? Example code:

How can I get the current date and time in PHP? Example code:

How can I use the json_encode function to convert an array or object to a JSON string in PHP? Example code:

How can I use the array_shift function to remove the first element from an array in PHP? Example code:

How can I use the rename function to rename a file or directory in PHP? Example code:

How can I loop through an array in PHP? Example code

How can I use the array_rand function to get a random key from an array in PHP? Example code:

How can I use the array_search function to search for a value in an array and return its key in PHP? Example code:

How can I use an if-else statement in PHP? Example code: