I understand little & big endian, but What's "machine byte order" mean?
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- duandazhen7306 2012-09-14 19:26关注
In pack the phrase "machine byte order" means that the endianess is determined by the current machine1
PHP itself makes no guarantees as to which endianness such characters (e.g.
S
,L
) encode data, except as the ordering relates to the current machine.Therefor, be cautious with using "machine byte order" pack characters and consider the guaranteed-order counter-parts (e.g.
n
,v
) if there is every any doubt1. However, pay attention to the target data specification as some silly formats like [Microsoft] UUIDs are laid out in terms of "machine byte order" while others are always big-endian or always little-endian.
1 x86/x64 is always little-endian, but PHP could technically run on big-endian machines .. somewhere. It is best to get into the habit of being explicit and precise to avoid having code suddenly and mysteriously "stop working" later on.
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