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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 |
|---|---|
| 105 | * @return bool|string False on failure, otherwise the oEmbed provider URL. |
| 106 | */ |
| 107 | function discover( $url ) { |
| 108 | $providers = array(); |
| 109 | |
| 110 | // Fetch URL content |
| 111 | if ( $html = wp_remote_retrieve_body( wp_remote_get( $url ) ) ) { |
| 112 | |
| 113 | // <link> types that contain oEmbed provider URLs |
| 114 | $linktypes = apply_filters( 'oembed_linktypes', array( |
| 115 | 'application/json+oembed' => 'json', |
| 116 | 'text/xml+oembed' => 'xml', |
| 117 | 'application/xml+oembed' => 'xml', // Incorrect, but used by at least Vimeo |
| 118 | ) ); |
| 119 | |
| 120 | // Strip <body> |
| 121 | $html = substr( $html, 0, stripos( $html, '</head>' ) ); |
| 122 | |
| 123 | // Do a quick check |