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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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155 |
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156 | /** |
157 | * Filters the media widget instance schema to add additional properties. |
158 | * |
159 | * @since 4.9.0 |
160 | * |
161 | * @param array $schema Instance schema. |
162 | * @param WP_Widget_Media $this Widget object. |
163 | */ |
164 | $schema = apply_filters( "widget_{$this->id_base}_instance_schema", $schema, $this ); |
165 |
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166 | return $schema; |
167 | } |
168 |
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169 | /** |
170 | * Determine if the supplied attachment is for a valid attachment post with the specified MIME type. |
171 | * |
172 | * @since 4.8.0 |
173 | * |