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

$i = 0;

do {
    echo $i . "<br>";
    $i++;
} while ($i < 10);

How can I use the array_unshift function to add an element to the beginning of an array in PHP? Example code:

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

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

How can I use the array_slice function to get a portion of an array in PHP? Example code:

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

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

How can I upload a file using PHP? Example code

How can I use the implode function to join an array into a string in PHP? Example code:

How can I use the implode function to join an array into a string with a separator in PHP? Example code:

How can I replace a substring in a string in PHP? Example code:

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

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

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

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

How can I calculate the sum of an array in PHP? Example code:

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

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

How can I use the array_merge function to merge two or more arrays in PHP? Example code:

How can I use the file_get_contents function to read the contents of a file into a string in PHP? Example code:

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

How can I use a switch statement with multiple cases in PHP? Example code:

How can I prevent SQL injection in PHP?

How can I use the array_chunk function to split an array into chunks in PHP? Example code:

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

How can I validate a form using PHP? Example code

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

How can I use the copy function to copy a file in PHP? Example code:

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

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

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