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On x86_64 glibc memrchr() uses SSE/AVX CPU extensions and works much faster then naive loop. On x86 32-bit we still use inlined version. memrchr() is a GNU extension. Its prototype becomes available when <string.h> is included with defined _GNU_SOURCE macro. Previously, we defined it in "php_config.h", but some sources may include <string.h> befire it. To avod mess we also pass -D_GNU_SOURCE to C compiler.