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App Engine offers you a choice between two PHP language environments. Both
environments have the same code-centric developer workflow, scale quickly and
efficiently to handle increasing demand, and enable you to use Google’s proven
serving technology to build your web, mobile and IoT applications quickly and
with minimal operational overhead. While the two environments have a lot in
common, they differ in a few important ways.
Choose your preferred environment
The PHP 7/8 runtimes are capable of running any framework, library, or
The PHP 5 runtime does not allow native code, filesystem access,
or arbitrary network connections, and has proprietary APIs.
Optimized to scale nearly instantaneously to handle huge traffic spikes.