Language: encapsed Undefined variable Warning cites wrong line — Zend user site (Zend/zend_compile.c)

[PurHur]

Category

Language · php-src-strict / encapsed-string diagnostics

Problem

Undefined-variable warnings raised while compiling encapsed string fetches (double-quoted, ${var}, heredoc) cite the opening statement line (often error_reporting(E_ALL) on line 2) instead of the expression site Zend reports.

Probed 2026-08-18 @ 5243c6f5e5 — Zend 8.2.32 vs php bin/vm.php / php bin/jit.php.

Repro	Zend 8.2.32	VM/JIT
echo "x=$missing\n"	Warning on line 3	Warning on line 2
$s = "a$missing b"	line 3	line 2
$s = "a{$missing} b"	line 3	line 2
echo "${missing}\n"	line 3	line 2
heredoc with $missing	line 4	line 2
echo $missing (plain)	line 3	line 3 ✓

Bare variable reads, assigns, and calls report the correct line; only encapsed fetch paths are off.

php-src reference

• php/php-src Zend/zend_compile.c — zend_compile_encapsed_string, FETCH_DIM_R / FETCH_R line info for warnings
• php/php-src Zend/zend_execute.c — ZEND_SEND_VARIABLE / ZEND_ROPE_* warning sites

PHP implementation target

• lib/Compiler.php — encapsed-string / rope lowering: propagate user start line for embedded variable fetches
• lib/VM.php — if warnings are emitted from compile-time rope setup, move to runtime fetch with correct opline or fix line on the emitted warn opcode
• No new runtime/*.c

Repro

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_undef_var_line.php'
./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_undef_var_encapsed_line.php'
./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_undef_var_heredoc_line.php'
./script/docker-exec.sh -- bash -lc 'php test/repro/maintainer_gap_undef_var_line.php'  # Zend baseline

Done when

• VM/JIT: encapsed/heredoc $undefined warnings cite the same line as Zend for double-quoted, brace, ${}, and heredoc forms
• Plain $undefined / undefined array-key echo unchanged (already green)
• Compliance .phpt under test/compliance/cases/language/
• php-src-strict; no php-compiler-strict shortcut

[PurHur]

claim: worker-lane-A — starting this run

[PurHur]

merged: #32059

Encapsed/heredoc $undefined warnings now cite the Zend user site (ConcatList CONCAT/CAST_STRING sourceLocation + JIT opline stamp).

Verification:

• php bin/vm.php / php bin/jit.php on test/repro/maintainer_gap_undef_var_{encapsed,heredoc,line}.php — lines match Zend 8.2.32
• ./script/phpunit.sh --filter EncapsedUndefVarWarningLine32034 — OK (VM + JIT)