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

Listen

$string = "Hello World";

echo strtoupper($string);

How can I use the strrev function to reverse a string in PHP? Example code:

How can I use the curl_init function to initialize a cURL session in PHP? Example code:

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

How can I check if a variable is set in PHP? Example code:

How can I send an email using PHP? Example code

How can I use the htmlspecialchars function to convert special characters to HTML entities in PHP? Example code:

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

How can I create a session variable in PHP? Example code

PHP Use Cases with Example Source Code

Get User IP Address using PHP – Source Code + Demo

How can I retrieve data from a MySQL database using PHP? Example code

How can I use a regular expression to replace a pattern in a string in PHP? Example code:

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

How can I validate a form using 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 check if a string contains a certain substring in PHP? Example code:

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

How can I use a conditional statement in PHP? Example code

How can I upload a file using PHP? Example code

How can I calculate the difference between two dates in PHP? Example code:

How can I trim whitespace from the beginning and end of a string in PHP? Example code:

How can I use the curl_exec function to execute a cURL session and get the response in PHP? Example code:

How can I use the array_walk function to apply a function to each element of an array in PHP? Example code:

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

How can I format a number with commas in PHP? Example code:

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

How can I read data from a JSON file using PHP? Example code:

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

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

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