1. You need to open the file orders.txt for writing. Modify the following code, specifically the two placeholders, to accomplish your goal. PHP

$fp = ___("$document_root/../orders/orders.txt", '___');

2. You need to use a PHP while loop to read from a file until the end of the file is reached. Modify the following code to accomplish your goal.

while (!___($fp))

3. Use PHP to close the file $fp programmatically.

4. Use the PHP fwrite function to write the string stored in $outputstring to the file pointed to by $fp.

5. Use PHP to echo the size of a file that's present in your current working directory.

6. Create an array (using full PHP syntax) named $products that contains the values gum, spam, and eggs.

7. Create a PHP array called $numbers with elements ranging from 1 to 10.

8. Edit the following code to accomplish the goal of reversing the array created by range().

$numbers = range(1,10);

$numbers = ___($numbers);

9. Replace the first element of the $products array with Fuses.

10. Given the following $products definition, perform an ascending alphabetical sort on its contents.

$products = array('Tires', 'Oil', 'Spark Plugs');

9. Use PHP to close the file $fp programmatically.