List files and directories inside the specified path in PHP

List of files:

• 12_2001.pdf
• 26_2001.pdf
• 65_2001.pdf
• 43_2001.pdf
• 2001.pdf
• 70_2001.pdf
• listagem.php
• file_index.htm
• 49_2001.pdf
• 20_2001.pdf
• 4_2001.pdf
• 34_2001.pdf
• 8_2001.pdf
• 1_2001.pdf