--configureoptions crashes with TypeError on PHP 8.5: array_key_exists() gets null

[esetnik]

Description

pecl install --configureoptions="enable-apcu-debug=no" apcu crashes with a TypeError on PHP 8.5.4 with PEAR 1.10.18:

Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /usr/local/lib/php/PEAR/Builder.php:397

This also reproduces with the -D shorthand:

pecl install -D "enable-apcu-debug=no" apcu

Environment

• PHP 8.5.4
• PEAR 1.10.18
• Docker image: cimg/php:8.5.4
• Extension: APCu 5.1.28 (but the bug is in PEAR, not APCu)

Root cause

_parseConfigureOptions() in Builder.php (line 88) wraps the input in XML:

$data = '<XML><PROPERTIES ' . $options . ' /></XML>';

With input enable-apcu-debug=no, this produces:

<XML><PROPERTIES enable-apcu-debug=no /></XML>

This is invalid XML — attribute values must be quoted (enable-apcu-debug="no"). On PHP 8.4 and earlier, xml_parse() was lenient and parsed it anyway. On PHP 8.5, the stricter XML parser silently rejects it, so _parseConfigureOptionsStartElement() is never called, _parsed_configure_options remains null, and line 397 crashes:

if (array_key_exists($option['name'], $this->_parsed_configure_options)) {

Suggested fix

Two issues to address:

1. Quote attribute values in _parseConfigureOptions() before building the XML string, or switch to a non-XML parser for key=value pairs.

2. Null guard on line 397 — if _parsed_configure_options is null (parsing failed), fall back to the interactive prompt instead of crashing:

if (is_array($this->_parsed_configure_options) && array_key_exists($option['name'], $this->_parsed_configure_options)) {

Workaround

Pipe the answer to stdin instead:

echo "no" | pecl install apcu