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…rgument Frameless calls pass the caller's operand zvals straight to the handler without taking a reference, so an argument freed by a __toString() that the handler itself triggers leaves it reading freed memory. Take a reference on array and array-or-string arguments in the Z_FLF_PARAM_ARRAY* macros and release it at flf_clean, so a destructive write from userland separates the array instead. The handle is kept in a local because the operand may be a reference slot that userland overwrites. This covers in_array(), preg_replace(), str_replace(), strtr() and implode(); the per-function guards from 8ce7f7f stay, since implode/1 parses its argument without the macros and php_implode() is public API. Z_FLF_PARAM_STR still reads its string directly on the fast path, so phpGH-21639 stays open. Fixes phpGH-23725
This was referenced Sep 17, 2026
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Frameless calls hand the handler the caller's operand zvals without taking a reference, so an argument freed by a __toString() the handler triggers leaves it reading freed memory. Taking the reference in the Z_FLF_PARAM_ARRAY macros generalizes the per-function guards from 8ce7f7f, as suggested on #23221, which this supersedes. Z_FLF_PARAM_STR still reads its string directly on the fast path, so GH-21639 stays open.
Fixes #23725