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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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214 | } |
215 |
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216 | /** |
217 | * Filter data for the current file to upload. |
218 | * |
219 | * @since 2.9.0 |
220 | * |
221 | * @param array $file An array of data for a single file. |
222 | */ |
223 | $file = apply_filters( 'wp_handle_upload_prefilter', $file ); |
224 |
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225 | // You may define your own function and pass the name in $overrides['upload_error_handler'] |
226 | $upload_error_handler = 'wp_handle_upload_error'; |
227 |
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228 | // You may have had one or more 'wp_handle_upload_prefilter' functions error out the file. Handle that gracefully. |
229 | if ( isset( $file['error'] ) && !is_numeric( $file['error'] ) && $file['error'] ) |
230 | return $upload_error_handler( $file, $file['error'] ); |
231 |
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232 | // You may define your own function and pass the name in $overrides['unique_filename_callback'] |