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