[php-src] Issue #14290: Member access within null pointer in extension spl

Issue: https://github.com/php/php-src/issues/14290 Author: YuanchengJiang ### Description The following code: ```php <?php class foo extends ArrayIterator { public function __construct( ) { parent::__construct(array( 'test'=>'test1')); } } $h = new foo; $i = new RegexIterator($h, '/^test(.*)/', RegexIterator::REPLACE); foreach ($i as $name=>$value) { var_dump($name, $value); } ?> ``` Resulted in this output: ``` /php-src/ext/spl/spl_iterators.c:1904:5: runtime error: member access within null pointer of type 'zend_string' (aka 'struct _zend_string') SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /php-src/ext/spl/spl_iterators.c:1904:5 ``` To reproduce: ``` /php-src/sapi/cli/php -n -c '/php-src/tmp-php.ini' -d "opcache.cache_id=worker31" -d "output_handler=" -d "open_basedir=" -d "disable_functions=" -d "output_buffering=Off" -d "error_reporting=32767" -d "display_errors=1" -d "display_startup_errors=1" -d "log_errors=0" -d "html_errors=0" -d "track_errors=0" -d "report_memleaks=1" -d "report_zend_debug=0" -d "docref_root=" -d "docref_ext=.html" -d "error_prepend_string=" -d "error_append_string=" -d "auto_prepend_file=" -d "auto_append_file=" -d "ignore_repeated_errors=0" -d "precision=14" -d "serialize_precision=-1" -d "memory_limit=128M" -d "opcache.fast_shutdown=0" -d "opcache.file_update_protection=0" -d "opcache.revalidate_freq=0" -d "opcache.jit_hot_loop=1" -d "opcache.jit_hot_func=1" -d "opcache.jit_hot_return=1" -d "opcache.jit_hot_side_exit=1" -d "opcache.jit_max_root_traces=100000" -d "opcache.jit_max_side_traces=100000" -d "opcache.jit_max_exit_counters=100000" -d "opcache.protect_memory=1" -d "zend.assertions=1" -d "zend.exception_ignore_args=0" -d "zend.exception_string_param_max_len=15" -d "short_open_tag=0" -d "extension_dir=/php-src/modules/" -d "zend_extension=/php-src/modules/opcache.so" -d "session.auto_start=0" -d "pcre.jit=0" -d "pcre.recursion_limit=2" -d "arg_separator.input==" -d "internal_encoding=UTF-8" -d "ary2[1]=a" -d "opcache.jit_buffer_size=1M" -f ./test.php ``` ### PHP Version latest commit ### Operating System ubuntu 22.04