List files and directories inside the specified path in PHP

List of files:

• 1_1998_2.pdf
• 82_1998_2.pdf
• 1998_2.pdf
• 28_1998_2.pdf
• 4_1998_2.pdf
• 34_1998_2.pdf
• 58_1998_2.pdf
• 90_1998_2.pdf
• 10_1998_2.pdf
• listagem.php
• file_index.htm
• 47_1998_2.pdf
• 105_1998_2.pdf
• 66_1998_2.pdf
• 99_1998_2.pdf
• 19_1998_2.pdf
• 76_1998_2.pdf