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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2007 | * Filters the database query. |
| 2008 | * |
| 2009 | * Some queries are made before the plugins have been loaded, |
| 2010 | * and thus cannot be filtered with this method. |
| 2011 | * |
| 2012 | * @since 2.1.0 |
| 2013 | * |
| 2014 | * @param string $query Database query. |
| 2015 | */ |
| 2016 | $query = apply_filters( 'query', $query ); |
| 2017 | |
| 2018 | if ( ! $query ) { |
| 2019 | $this->insert_id = 0; |
| 2020 | return false; |
| 2021 | } |
| 2022 | |
| 2023 | $this->flush(); |
| 2024 | |
| 2025 | // Log how the function was called. |