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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 |
---|---|
5393 | do_action( 'deprecated_function_run', $function_name, $replacement, $version ); |
5394 |
|
5395 | /** |
5396 | * Filters whether to trigger an error for deprecated functions. |
5397 | * |
5398 | * @since 2.5.0 |
5399 | * |
5400 | * @param bool $trigger Whether to trigger the error for deprecated functions. Default true. |
5401 | */ |
5402 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |
5403 | if ( function_exists( '__' ) ) { |
5404 | if ( $replacement ) { |
5405 | trigger_error( |
5406 | sprintf( |
5407 | /* translators: 1: PHP function name, 2: Version number, 3: Alternative function name. */ |
5408 | __( 'Function %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ), |
5409 | $function_name, |
5410 | $version, |
5411 | $replacement |