[PurHur]

Summary

• Implements stream_socket_recvfrom() (leftover from Stdlib: stream_socket_shutdown()/get_name()/recvfrom()/sendto() — socket stream phase 2 (ext/standard/streamsfuncs.c) #6043) via host-stream fallback, matching stream_socket_shutdown
• length <= 0 raises Zend-shaped ValueError; optional $address out-arg supported
• Compliance .phpt + capability / bootstrap-inventory resync
• php-src ref: ext/standard/streamsfuncs.c PHP_FUNCTION(stream_socket_recvfrom)
• PHP impl: ext/standard/stream_socket_recvfrom.php, VmStreamSocketRecvfrom(Pure).php

Closes #21007

Test plan

• Issue repro (VM):

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
cat > /tmp/recvfrom.php <<'"'"'PHP'"'"'
<?php
echo function_exists("stream_socket_recvfrom") ? "1" : "0", "\n";
$srv = stream_socket_server("tcp://127.0.0.1:0");
$addr = stream_socket_get_name($srv, false);
$cli = stream_socket_client("tcp://".$addr);
$peer = stream_socket_accept($srv);
fwrite($cli, "hello");
$buf = stream_socket_recvfrom($peer, 100);
var_export($buf); echo "\n";
try { stream_socket_recvfrom($peer, 0); } catch (Throwable $e) { echo get_class($e), ": ", $e->getMessage(), "\n"; }
PHP
php bin/vm.php /tmp/recvfrom.php'

Output:

1
'hello'
ValueError: stream_socket_recvfrom(): Argument #2 ($length) must be greater than 0

• vendor/bin/phpunit --filter stream_socket_recvfrom → OK (2 tests)
• ./script/check-generated-docs.sh → all generated docs in sync

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