Fatal error: Uncaught TypeError: explode() in class-wp-dependencies.php:187

[bobbingwide]

Today, while updating the block docs for WordPress 6.1 I got a Fatal error when attempting to edit https://blocks.wp.a2z/block/no-results-core-query-no-results/

Gutenberg version: 14.1.1.
Latest version of Gutenberg is 14.4.0

Warning: Array to string conversion in C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php on line 76

Warning: Array to string conversion in C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php on line 76

Fatal error: Uncaught TypeError: explode(): Argument #2 ($string) must be of type string, array given in C:\apache\htdocs\wp-a2z\wp-includes\class-wp-dependencies.php:187

Stack trace:
#0 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-dependencies.php(187): explode('?', Array)
#1 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-styles.php(371): WP_Dependencies->all_deps(Array, false, false)
#2 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-dependencies.php(127): WP_Styles->all_deps(Array)
#3 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php(83): WP_Dependencies->do_items(Array)
#4 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php(109): gutenberg_resolve_assets()
#5 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-hook.php(310): {closure}(Array)
#6 C:\apache\htdocs\wp-a2z\wp-includes\plugin.php(205): WP_Hook->apply_filters(Array, Array)
#7 C:\apache\htdocs\wp-a2z\wp-includes\block-editor.php(539): apply_filters('block_editor_se...', Array, Object(WP_Block_Editor_Context))
#8 C:\apache\htdocs\wp-a2z\wp-admin\edit-form-blocks.php(284): get_block_editor_settings(Array, Object(WP_Block_Editor_Context))
#9 C:\apache\htdocs\wp-a2z\wp-admin\post.php(187): require('C:\\apache\\htdoc...')
#10 {main}
  thrown in <b>C:\apache\htdocs\wp-a2z\wp-includes\class-wp-dependencies.php</b> on line <b>187</b><br />

[bobbingwide]

Updating to Gutenberg 14.4.0 seemed to resolve the issue.
It still crashed with: 14.3.1, 14.3.0 and 14.2.0
Which might be a bit of a shame since WordPress 6.1 includes Gutenberg 14.1

[bobbingwide]

I retested after updating to WordPress 6.1-RC5.
I still get the errors with Gutenberg 14.3.1 and earlier

Gutenberg version	Result
14.4.0	works
14.3.1	fails as above
14.3.0	fails as above
14.2.0	fails as above
14.1.1	fails as above

[bobbingwide]

The stack trace for the first warning

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\bwtrace-actions.php(286:2) bw_trace_error_handler(1) 219 24 2022-10-31T21:19:52+00:00 2.758449 0.023853 cf=block_editor_settings_all 76280 168 10266 18874368/18874368 512M F=1303 err Array

[0] => (integer) 2
[1] => (string) "Warning: Array to string conversion"
[2] => (string) "C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php"
[3] => (integer) 76

0. bw_lazy_backtrace C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\libs\bwtrace.php:108 0
1. bw_backtrace C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\bwtrace-actions.php:293 0
2. bw_trace_error_handler(2,Array to string conversion,C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php,76) C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\bwtrace-actions.php:0 4
3. array_unique(array) C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php:76 1
4. gutenberg_resolve_assets C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat\wordpress-6.0\client-assets.php:109 0
5. {closure}(array) C:\apache\htdocs\wp-a2z\wp-includes\class-wp-hook.php:310 1
6. apply_filters(array,array) C:\apache\htdocs\wp-a2z\wp-includes\plugin.php:205 2
7. apply_filters(block_editor_settings_all,array,object) C:\apache\htdocs\wp-a2z\wp-includes\block-editor.php:539 3
8. get_block_editor_settings(array,object) C:\apache\htdocs\wp-a2z\wp-admin\edit-form-blocks.php:284 2
9. require(C:\apache\htdocs\wp-a2z\wp-admin\edit-form-blocks.php) C:\apache\htdocs\wp-a2z\wp-admin\post.php:187 1

is most likely related to the fact that the style_handles array is not flat, with two entries which are themselves arrays.

  [151] => Array

        [0] => (string) "wp-block-post-comments-form"
        [1] => (string) "wp-block-buttons"
        [2] => (string) "wp-block-button"

and

 [228] => Array

        [0] => (string) "wp-block-post-comments"
        [1] => (string) "wp-block-buttons"
        [2] => (string) "wp-block-button"

In WP 6.1-RC5 if _wp_get_iframed_editor_assets() exists then the filter function for block_editor_settings_all just returns the $settings.

In WP 6.1-RC3 it called gutenberg_resolve_assets(), which produced the Warnings.

I believe I've found the original issue. WordPress/gutenberg#45301

[bobbingwide]

_wp_get_iframed_editor_assets() uses different logic to gutenberg_resolve_assets() to build $style_handles and $script_handles

foreach ( $block_registry->get_all_registered() as $block_type ) {
		$style_handles = array_merge(
			$style_handles,
			$block_type->style_handles,
			$block_type->editor_style_handles
		);

		$script_handles = array_merge(
			$script_handles,
			$block_type->script_handles
		);
	}

compared with the logic in gutenberg_resolve_assets(), which doesn't use array_merge().

foreach ( $block_registry->get_all_registered() as $block_type ) {
		if ( ! empty( $block_type->style ) ) {
			$style_handles[] = $block_type->style;
		}

		if ( ! empty( $block_type->editor_style ) ) {
			$style_handles[] = $block_type->editor_style;
		}

		if ( ! empty( $block_type->script ) ) {
			$script_handles[] = $block_type->script;
		}
	}