rtrim(): Passing null to parameter #1 ($string) of type string is deprecated

Hi,

I’m a TP Premium user. But somehow the error lies in the free plugin version.

The issue was noticed thanks to Query Monitor plugin. Using it, you will likely be able to see the PHP deprecation warning upon using TP with URL translation.

It appears the issue resides in class-url-converter.php that returns a null parameter to a string, which would be deprecated by PHP 8. That is my understanding as a sysadmin, I’m no PHP dev, so a direct look at the error will surely help you better understand the issue.

So here is what Query Monitor reveals:

Deprecated	

rtrim(): Passing null to parameter #1 ($string) of type string is deprecated	

    wp-includes/formatting.php:2819
    rtrim()
    wp-includes/formatting.php:2819
    untrailingslashit()
    wp-includes/formatting.php:2804
    trailingslashit()
    wp-content/plugins/translatepress-multilingual/includes/class-url-converter.php:437
    TRP_Url_Converter->get_url_for_language()
    wp-content/plugins/translatepress-multilingual/partials/language-switcher-shortcode.php:22
    TRP_Language_Switcher->language_switcher()
    wp-includes/shortcodes.php:434
    do_shortcode_tag()
    wp-includes/shortcodes.php:434
    preg_replace_callback()
    wp-includes/shortcodes.php:273
    do_shortcode()
    wp-content/plugins/translatepress-multilingual/includes/gutenberg-blocks/ls-shortcode/ls-shortcode.php:142
    TRP_Gutenberg_Blocks->{closure}()
    wp-includes/class-wp-hook.php:324
    do_action('trp/language-switcher/render_callback')
    wp-content/plugins/translatepress-multilingual/includes/gutenberg-blocks/ls-shortcode/ls-shortcode.php:24
    TRP_Gutenberg_Blocks->{closure}()
    wp-includes/class-wp-block.php:519
    WP_Block->render()
    wp-includes/class-wp-block.php:499
    WP_Block->render()
    wp-includes/class-wp-block.php:499
    WP_Block->render()
    wp-includes/class-wp-block.php:499
    WP_Block->render()
    wp-includes/blocks.php:2061
    render_block()
    wp-includes/blocks.php:2113
    do_blocks()
    wp-includes/blocks/template-part.php:154
    render_block_core_template_part()
    wp-includes/class-wp-block.php:519
    WP_Block->render()
    wp-includes/blocks.php:2061
    render_block()
    wp-includes/blocks.php:2113
    do_blocks()
    wp-includes/block-template.php:260
    get_the_block_template_html()
    wp-includes/template-canvas.php:12

	1	Extension : translatepress-multilingual

I hope this is useful in some way! And I remain available if further details are required to help diagnose and resolve the issue.

Best regards

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