List files and directories inside the specified path in PHP

List of files:

• 28_2000.pdf
• 1_2000.pdf
• 46_2000.pdf
• 16_2000.pdf
• 56_2000.pdf
• 122_2000.pdf
• listagem.php
• file_index.htm
• 83_2000.pdf
• 69_2000.pdf
• 4_2000.pdf
• 39_2000.pdf
• 2000.pdf
• 53_2000.pdf
• 110_2000.pdf
• 94_2000.pdf