[PurHur]

Summary

• var_export() on arrays with NUL-byte keys (e.g. from get_mangled_object_vars()) now emits php-src concatenation form: '' . "\0" . '*' . "\0" . 'w' => 1.
• PHP SSOT: ext/standard/VmVarExport.php — shared by VM and JIT via VarExportJitHelper (php-in-php: JIT StringVarExportJit — route var_export() through VmVar PHP not __compiler_var_export LLVM (#1492) #9189).
• php-src reference: ext/standard/var.c — php_array_element_export() / php_str_to_str NUL replacement.

Closes #13875

Test plan

./script/docker-exec.sh -- php test/repro/maintainer_gap_var_export_mangled_array_keys.php
# ok

./script/docker-exec.sh -- php bin/vm.php test/repro/maintainer_gap_var_export_mangled_array_keys.php
# ok

# Zend/VM output match:
# array (
#   '' . "\0" . '*' . "\0" . 'w' => 1,
#   '' . "\0" . 'C' . "\0" . 'p' => 2,
# )

./script/docker-exec.sh -- bash -lc 'cd /compiler && vendor/bin/phpunit test/compliance/VarExportVMTest.php test/compliance/VarExportJITTest.php'
# OK (4 tests)

./script/docker-exec.sh -- bash -lc 'cd /compiler && php bin/compile.php -l test/repro/maintainer_gap_var_export_mangled_array_keys.php'
# AOT lint OK

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