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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 |
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213 |
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214 | /** |
215 | * The dynamic portion of the hook name, $action, refers to the post action. |
216 | * |
217 | * @since 2.9.0 as 'wp_handle_upload_prefilter' |
218 | * @since 4.0.0 Converted to a dynamic hook with $action |
219 | * |
220 | * @param array $file An array of data for a single file. |
221 | */ |
222 | $file = apply_filters( "{$action}_prefilter", $file ); |
223 |
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224 | // You may define your own function and pass the name in $overrides['upload_error_handler'] |
225 | $upload_error_handler = 'wp_handle_upload_error'; |
226 | if ( isset( $overrides['upload_error_handler'] ) ) { |
227 | $upload_error_handler = $overrides['upload_error_handler']; |
228 | } |
229 |
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230 | // You may have had one or more 'wp_handle_upload_prefilter' functions error out the file. Handle that gracefully. |
231 | if ( isset( $file['error'] ) && ! is_numeric( $file['error'] ) && $file['error'] ) { |