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Fix test failures in engine_unsafe_empty_string.phpt (#18727) #1236

Job	Run time
LINUX_X64_${{ matrix.debug && 'DEBUG' \|\| 'RELEASE' }}_${{ matrix.zts && 'ZTS' \|\| 'NTS' }}${{ matrix.asan && '_ASAN' \|\| '' }}	0s
BENCHMARKING	0s
LINUX_X32_DEBUG_ZTS	0s
WINDOWS_X64_ZTS	0s
FREEBSD	0s
MACOS_DEBUG_NTS	-9s
	-9s

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