Stdlib: memory_get_usage() real_usage: named — Unknown named parameter vs Zend (ext/standard/basic_functions.c) #11578

Category

stdlib · php-src-strict · refs #1492

Problem

memory_get_usage(real_usage: true) must be accepted (parameter name per php-src stub). Zend: memory_get_usage_named_ok=1. VM throws at runtime:

Error: Unknown named parameter $real_usage

Positional memory_get_usage(true) may work; failure is missing named-parameter registration for real_usage.

Verified 2026-06-25 — test/repro/maintainer_gap_memory_get_usage_named_real_usage.php.

php-src reference

• php/php-src ext/standard/basic_functions.c — zif_memory_get_usage
• Stub: function memory_get_usage(bool $real_usage = false): int

Repro

test/repro/maintainer_gap_memory_get_usage_named_real_usage.php

php test/repro/maintainer_gap_memory_get_usage_named_real_usage.php
php bin/vm.php test/repro/maintainer_gap_memory_get_usage_named_real_usage.php

Implementation hints (PHP-in-PHP)

• Register real_usage in builtin metadata used by named-arg binder (ext/standard/, shared with JIT)
• Same fix pattern as Stdlib: mb_strlen() string:/encoding: named parameters rejected (ext/mbstring/mbstring.c) #10044 mb_strlen named params
• No new C runtime

Done when

• Repro: memory_get_usage_named_ok=1 on VM
• memory_get_peak_usage(real_usage: true) named if stub exposes same parameter name

Related

• Stdlib: memory_get_usage()/memory_get_peak_usage() real_usage peaks must dominate emalloc (zend_alloc.c) #4933 real_usage peak semantics · Stdlib: memory_get_usage() accepts arbitrary int-backed enum — must reject non-MemoryUsage (ext/standard/basic_functions.c) #9336 MemoryUsage enum · Stdlib: mb_strlen() string:/encoding: named parameters rejected (ext/mbstring/mbstring.c) #10044 mb_strlen named · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492