wp_title if archive of year w/o permalink fires php notice in locale.php

[michelwppi]

PHP Notice : Undefined index: 00 in /Applications/MAMP/htdocs/wp_svn41/wp-includes/locale.php on line 271

The concerned function : $wp_locale->get_month

Permalinks = default like: www.mysite.com/?m=2015

The calling function = wp_title in general-template.php

Here:

// If there's a month
        if ( is_archive() && !empty($m) ) {
                $my_year = substr($m, 0, 4);
                $my_month = $wp_locale->get_month(substr($m, 4, 2)); error_log("here calling...");
                $my_day = intval(substr($m, 6, 2));
                $title = $my_year . ( $my_month ? $t_sep . $my_month : '') . ( $my_day ? $t_sep . $my_day : '' );
        }

This part of function forget that 'm' query_tag can have a length from 4 to 9+ as well defined in query.php - not only month...

if ( $qv['m'] ) {
                                $this->is_date = true;
                                if ( strlen($qv['m']) > 9 ) {
                                        $this->is_time = true;
                                } else if ( strlen($qv['m']) > 7 ) {
                                        $this->is_day = true;
                                } else if ( strlen($qv['m']) > 5 ) {
                                        $this->is_month = true;
                                } else {
                                        $this->is_year = true;
                                }
                        }

and $wp_locale->get_month do not like empty string giving '00' index...

Suggestion (raw):

Add test ( strlen($m) >= 5 ) before to call $wp_locale->get_month

like

$my_month = ( strlen($m) >= 5 ) ? $wp_locale->get_month(substr($m, 4, 2))
: "";

Cheers,

M.

[DrewAPicture]

Hi @michelwppi, are you still experiencing this issue in 4.2?

[michelwppi]

@DrewAPicture
This issue remains in WP 4.2 because the test of

strlen($m) >=5

is not done in function wp_title line 829 like done in wp_query of wp_query.php.

Cheers

[herregroen]

Currently looking at this.

To help others, the steps to reproduce:

1. set permalinks to plain.
2. Add wp_title somewhere on your archive page.
3. Go to yourdomain.com?m=2017.
4. See the error before wp_title is output.

[herregroen]

Cleans up date parsing in wp_title.

[davidmosterd]

I was discussing with @herregroen that we could also just move the $wp_locale->get_month( $my_month ) check to the conditional echo. That would minimize the adjustment to the code and solve the issue as well. Like so:

$title = $my_year . ( $my_month ? $t_sep . $wp_locale->get_month( $my_month ) : '' ) . ( $my_day ? $t_sep . $my_day : '' );

[herregroen]

Added a patch that cleans up the date parsing by reusing the same WP_Query globals is_time, is_day and is_month to do the checks.

Used an array to implode to avoid a huge assignment to $title.

More changes but I think overall more readable code.

[davidmosterd]

Patch with my comment

[DrewAPicture]

Assigning to mark the good-first-bug as "claimed".