Many functions in PHP6.0 are no longer backward compatible? What should I do?

Source: Internet
Author: User
Many functions in PHP6.0 are no longer backward compatible? If so, the future migration will not be very tiring. For example, for XML processing, xml_parser_create and other functions, is php6.0 nearly absent? may I ask my friend who has used PHP6? is the XML processing method of PHP6 backward compatible ?, Some mixed functions are being developed, but they are becoming increasingly popular. the faster the development, the more compatible the PHP6.0 functions a year ago?
If so, the future migration will not be very tiring.
For example, XML processing, Xml_parser_createIs this type of function close to php6.0?
If I have used PHP6, is the XML processing method of PHP6 still backward compatible?

------ Solution --------------------
Mixed development means that the development is still in progress, but the development is getting faster and faster
For example, one year ago, creatures on the Earth were just evolving.
You can also choose to use asp, a product that is no longer mixed.
ASP. NET is also in progress

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