public int getProgramHeaderCount() {
		return e_phnum;
	}
This member holds the number of entries in the program header table. Thus the product
of e_phentsize and unsigned e_phnum gives the table's size in bytes. If original 
e_phnum equals PNXNUM (0xffff) an attempt will be made to obtained the extended size
from section[0].sh_info field.  If a file has no program header table, e_phnum holds 
the value zero.
@return the number of entries in the program header table
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/elf/ElfHeader.java