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PHP is a popular dynamic programming language for web applications. PHP comes with extensions that provide a wide range of capabilities including database access. The OCI8 extension in PHP allows applications to connect to Oracle Database. It has support for basic and advanced Oracle Database features, allowing easy and efficient use of SQL and PL/SQL. Without pooling, frequent connection creation and destruction can be expensive and crippling to high scalability. Oracle's traditional middle-tier connection pools were not applicable to the multi-process PHP architecture. Caching connections within PHP removed connection creation and destruction costs but did not achieve optimal connection resource utilization, incurring unnecessary memory overhead in the database.
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