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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 |
|---|---|
| 912 | * |
| 913 | * @since 3.0.0 |
| 914 | * @since 4.2.0 The `$expiration` parameter was added. |
| 915 | * @since 4.4.0 The `$transient` parameter was added. |
| 916 | * |
| 917 | * @param mixed $value New value of transient. |
| 918 | * @param int $expiration Time until expiration in seconds. |
| 919 | * @param string $transient Transient name. |
| 920 | */ |
| 921 | $value = apply_filters( "pre_set_transient_{$transient}", $value, $expiration, $transient ); |
| 922 | |
| 923 | /** |
| 924 | * Filters the expiration for a transient before its value is set. |
| 925 | * |
| 926 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 927 | * |
| 928 | * @since 4.4.0 |
| 929 | * |
| 930 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |