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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 |
---|---|
936 | * |
937 | * @since 3.0.0 |
938 | * @since 4.2.0 The `$expiration` parameter was added. |
939 | * @since 4.4.0 The `$transient` parameter was added. |
940 | * |
941 | * @param mixed $value New value of transient. |
942 | * @param int $expiration Time until expiration in seconds. |
943 | * @param string $transient Transient name. |
944 | */ |
945 | $value = apply_filters( "pre_set_transient_{$transient}", $value, $expiration, $transient ); |
946 |
|
947 | /** |
948 | * Filters the expiration for a transient before its value is set. |
949 | * |
950 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
951 | * |
952 | * @since 4.4.0 |
953 | * |
954 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |