"array of purposes" is a correct and usable phrase in written English.
It can be used to refer to a wide variety or range of purposes or reasons for something. Example: The new technology was designed to serve an array of purposes, from improving efficiency to enhancing user experience.
An SAB Miller project in Colombia called Oportunidades Bavaria (named after the local beer, called Bavaria) supports small-scale retailers with loans of about $100 to $1,000 for a broad array of purposes: fixing up or expanding a store, sending a child to college or even funeral expenses for a relative.
And, (5) simple plantation forestry which has a narrow and intensive management focus on producing a forest crop for a limited array of purposes, may not meet societal demands for a range of outputs from plantations in addition to wood and pulp.
And they have been used for a wide array of purposes.
The promise of the field of synbio as a whole is that scientists will be able to employ this type of genome synthesis to create customized life forms for a wide array of purposes.
Politically, it's much easier for policymakers to shrink a block grant that supports a vast array of purposes spread across 50 states -- and claim that states can compensate by improving efficiency or rooting out "waste, fraud and abuse" -- than to cut specific types of assistance for specific groups of people such as low-income children, seniors, or people with disabilities.
The Bank provides low-interest loans, interest-free credits and grants to developing country governments for a wide array of purposes that include investments in education, health, infrastructure, private sector development, agriculture, and environmental and natural resource management.
In addition, it is clear that such data could have an array of 'secondary' purposes, including use off-line for improving scheduling efficiency and for automatic performance monitoring, thus reducing or removing the need for manual on-street surveys.
And they now use that dashboard and Hootsuite for a growing array of other purposes, from placing ads to content marketing to analytics across an increasing number of platforms — a range of services that Hootsuite has developed both in-house and by way of acquisition.
They film the games for an array of future purposes such as documenting the history of the sport.
While television networks focus on the live events each week, their division films the games — yes, much is still on actual 16-millimeter film — for an array of future purposes.
The Chinese of the Tang period employed complex chemical formulas for an array of different purposes, often found through experiments of alchemy.
