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

$data = array(
    "name" => "John Doe",
    "age" => 30,
    "email" => "[email protected]"
);

$json_string = json_encode($data);

echo $json_string;

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 the explode function to split a string into 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:

Get User IP Address using PHP – Source Code + Demo

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

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

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

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

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

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

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

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

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

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

How can I generate a random string in PHP? Example code:

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

How can I use the array_keys function to get an array of keys from an associative array 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 format a date in PHP? Example code:

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

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

How can I use the explode function to split a string into an array with a limit in PHP? Example code:

How can I add days to a date in PHP? Example code:

How can I use the array_values function to get an array of values from an associative array in PHP? Example code:

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

How can I prevent SQL injection in PHP?