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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 |
|---|---|
| 3435 | |
| 3436 | /** |
| 3437 | * Fires when a deprecated constructor is called. |
| 3438 | * |
| 3439 | * @since 4.3.0 |
| 3440 | * |
| 3441 | * @param string $class The class containing the deprecated constructor. |
| 3442 | * @param string $version The version of WordPress that deprecated the function. |
| 3443 | */ |
| 3444 | do_action( 'deprecated_constructor_run', $class, $version ); |
| 3445 | |
| 3446 | /** |
| 3447 | * Filter whether to trigger an error for deprecated functions. |
| 3448 | * |
| 3449 | * `WP_DEBUG` must be true in addition to the filter evaluating to true. |
| 3450 | * |
| 3451 | * @since 4.3.0 |
| 3452 | * |
| 3453 | * @param bool $trigger Whether to trigger the error for deprecated functions. Default true. |