List files and directories inside the specified path in PHP

List of files:

• 109_1997.pdf
• 23_1997.pdf
• 86_1997.pdf
• 128_1997.pdf
• 95_1997.pdf
• 1_1997.pdf
• 4_1997.pdf
• 1997.pdf
• 52_1997.pdf
• 45_1997.pdf
• 68_1997.pdf
• 79_1997.pdf
• listagem.php
• file_index.htm
• 139_1997.pdf
• 10_1997.pdf
• 37_1997.pdf