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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.
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273 | ); |
274 |
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275 | /** |
276 | * Filters whether jsonp is enabled. |
277 | * |
278 | * @since 4.4.0 |
279 | * |
280 | * @param bool $jsonp_enabled Whether jsonp is enabled. Default true. |
281 | */ |
282 | $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true ); |
283 |
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284 | $jsonp_callback = null; |
285 |
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286 | if ( isset( $_GET['_jsonp'] ) ) { |
287 | if ( ! $jsonp_enabled ) { |
288 | echo $this->json_error( 'rest_callback_disabled', __( 'JSONP support is disabled on this site.' ), 400 ); |
289 | return false; |
290 | } |
291 |
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