(PECL xhprof >= 0.9.0)
xhprof_sample_enable — Start XHProf profiling in sampling mode
Starts profiling in sample mode, which is a lighter weight version of xhprof_enable(). The sampling interval is 0.1 seconds, and samples record the full function call stack. The main use case is when lower overhead is required when doing performance monitoring and diagnostics.
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