Garbage Collect

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/ˈgɑrbɪʤ kəˈlɛkt/

An application runs until the heap is exhausted of free memory, at which point the GC stops all application code, performs a garbage collect, and then lets the application continue.
PHP has a pretty simple garbage collector, which basically will garbage collect an object when it no longer is in scope.
This configuration provides a balance between how often the garbage collector runs and how long it takes the garbage collector to collect garbage.
If the heap is close to the memory usage of the application, the garbage collector has to collect the heap too often, and performance suffers.
It is possible to force garbage collection by calling collect, but most of the time, this should be avoided because it may create performance issues.

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