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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 |
|---|---|
| 2009 | * |
| 2010 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 2011 | * |
| 2012 | * @since 3.0.0 |
| 2013 | * @since 4.4.0 The `$transient` parameter was added. |
| 2014 | * |
| 2015 | * @param mixed $value New value of site transient. |
| 2016 | * @param string $transient Transient name. |
| 2017 | */ |
| 2018 | $value = apply_filters( "pre_set_site_transient_{$transient}", $value, $transient ); |
| 2019 | |
| 2020 | $expiration = (int) $expiration; |
| 2021 | |
| 2022 | /** |
| 2023 | * Filters the expiration for a site transient before its value is set. |
| 2024 | * |
| 2025 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 2026 | * |
| 2027 | * @since 4.4.0 |