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\u73b0\u5728\u4e3a\u60a8\u7684\u4ee3\u7801\u7247\u6bb5\u6dfb\u52a0\u540d\u79f0\uff0c\u5e76\u5728\u201c\u4ee3\u7801\u9884\u89c8\u201d\u90e8\u5206\u4e2d\u8f93\u5165\u4ee3\u7801\u3002<\/p>\n\n\n\n

\u7531\u4e8e\u4ee3\u7801\u5305\u542b PHP\uff0c\u56e0\u6b64\u8bf7\u786e\u4fdd\u9009\u62e9\u201c\u4ee3\u7801\u7c7b\u578b\u201d\u4f5c\u4e3a PHP \u7247\u6bb5\u3002<\/p>\n\n\n\n

\"\u6dfb\u52a0\u540e\u5907\u56fe\u50cf\"<\/figure>\n\n\n\n

\u53ea\u9700\u590d\u5236\u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\u5e76\u5c06\u5176\u7c98\u8d34\u5230\u201c\u4ee3\u7801\u9884\u89c8\u201d\u5b57\u6bb5\u4e2d\u5373\u53ef\u3002<\/p>\n\n\n\n

1234567891011121314151617 \u53f718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201\u7b2c202\u7ae0203204205206207208209210211212<\/td>\/**<\/code> <\/code>* Plugin Name: Category Thumbnail Fallback<\/code> <\/code>* Description: Use the category image as fallback when the post does not have a featured image<\/code> <\/code>*\/<\/code>class<\/code>WPBCategoryThumbnailFallback<\/code>{<\/code>    <\/code>protected<\/code>static<\/code>$taxonomies<\/code>= [<\/code>'category'<\/code>];<\/code>    <\/code>protected<\/code>$nonceId<\/code>= <\/code>'wpb_category_thumb_fallback_none'<\/code>;<\/code>    <\/code>protected<\/code>$fieldId<\/code>= <\/code>'wpb_category_fallback_post_image'<\/code>;<\/code>    <\/code>public<\/code>$taxonomy<\/code>;<\/code>    <\/code>protected<\/code>function<\/code>__construct(<\/code>$taxonomy<\/code>)<\/code>    <\/code>{<\/code>        <\/code>$this<\/code>->taxonomy = <\/code>$taxonomy<\/code>;<\/code>    <\/code>}<\/code>    <\/code>public<\/code>static<\/code>function<\/code>init()<\/code>    <\/code>{<\/code>        <\/code>foreach<\/code>(<\/code>static<\/code>::<\/code>$taxonomies<\/code>as<\/code>$taxonomy<\/code>) {<\/code>            <\/code>$_self<\/code>= <\/code>new<\/code>self(<\/code>$taxonomy<\/code>);<\/code>            <\/code>add_action(<\/code>'admin_enqueue_scripts'<\/code>, [<\/code>$_self<\/code>, <\/code>'scripts'<\/code>]);<\/code>            <\/code>add_action(<\/code>\"{$taxonomy}_add_form_fields\"<\/code>, [<\/code>$_self<\/code>, <\/code>'add'<\/code>]);<\/code>            <\/code>add_action(<\/code>\"{$taxonomy}_edit_form_fields\"<\/code>, [<\/code>$_self<\/code>, <\/code>'edit'<\/code>], 99, 2);<\/code>            <\/code>add_action(<\/code>\"created_{$taxonomy}\"<\/code>, [<\/code>$_self<\/code>, <\/code>'saveTerm'<\/code>], 10, 2);<\/code>            <\/code>add_action(<\/code>\"edited_{$taxonomy}\"<\/code>, [<\/code>$_self<\/code>, <\/code>'editTerm'<\/code>], 10, 2);<\/code>            <\/code>add_filter(<\/code>\"get_post_metadata\"<\/code>, [<\/code>$_self<\/code>, <\/code>'fallback'<\/code>], 99, 5);<\/code>        <\/code>}<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>scripts(<\/code>$hook_suffix<\/code>)<\/code>    <\/code>{<\/code>        <\/code>if<\/code>(in_array(<\/code>$hook_suffix<\/code>, [<\/code>'term.php'<\/code>, <\/code>'edit-tags.php'<\/code>])) {<\/code>            <\/code>$screen<\/code>= get_current_screen();<\/code>            <\/code>if<\/code>(<\/code>is_object<\/code>(<\/code>$screen<\/code>) && <\/code>\"edit-{$this->taxonomy}\"<\/code>== <\/code>$screen<\/code>->id) {<\/code>                <\/code>wp_enqueue_media();<\/code>                <\/code>wp_add_inline_script(<\/code>'media-editor'<\/code>, <\/code>$this<\/code>->inlineScript());<\/code>            <\/code>}<\/code>        <\/code>}<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>add()<\/code>    <\/code>{<\/code>        <\/code>?><\/code>        <\/code><div <\/code>class<\/code>=<\/code>\"form-field upload_image-wrap\"<\/code>><\/code>            <\/code><label <\/code>for<\/code>=<\/code>\"upload_image\"<\/code>>Image<\/label><\/code>            <\/code><input id=<\/code>\"upload_image\"<\/code>type=<\/code>\"hidden\"<\/code>size=<\/code>\"36\"<\/code>name=\"<?php<\/code>            <\/code>echo<\/code>esc_attr(<\/code>$this<\/code>->fieldId)<\/code>            <\/code>?><\/code>\" value=\"<\/code>\"\/><\/code>            <\/code><div id=<\/code>\"wpb-category-image-preview\"<\/code>style=<\/code>\"max-width: 150px; max-height: 150px;\"<\/code>><\/div><\/code>            <\/code><input id=<\/code>\"upload_image_button\"<\/code>class<\/code>=<\/code>\"button\"<\/code>type=<\/code>\"button\"<\/code>value=<\/code>\"Upload Image\"<\/code>\/><\/code>            <\/code><p>Enter a URL <\/code>or<\/code>upload an image<\/p><\/code>        <\/code><\/div><\/code>        <\/code><?php<\/code>        <\/code>wp_nonce_field(<\/code>$this<\/code>->nonceId, <\/code>$this<\/code>->nonceId);<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>edit(<\/code>$term<\/code>, <\/code>$taxonomy<\/code>)<\/code>    <\/code>{<\/code>        <\/code>$value<\/code>= get_term_meta(<\/code>$term<\/code>->term_id, <\/code>$this<\/code>->fieldId, true);<\/code>        <\/code>$image<\/code>= wp_get_attachment_image((int)<\/code>$value<\/code>);<\/code>        <\/code>?><\/code>        <\/code><tr <\/code>class<\/code>=<\/code>\"form-field upload_image-wrap\"<\/code>><\/code>            <\/code><th scope=<\/code>\"row\"<\/code>><label <\/code>for<\/code>=<\/code>\"name\"<\/code>>Image<\/label><\/th><\/code>            <\/code><td><\/code>                <\/code><label <\/code>for<\/code>=<\/code>\"upload_image\"<\/code>><\/code>                    <\/code><input id=<\/code>\"upload_image\"<\/code>type=<\/code>\"hidden\"<\/code>size=<\/code>\"36\"<\/code>name=\"<?php<\/code>                    <\/code>echo<\/code>esc_attr(<\/code>$this<\/code>->fieldId)<\/code>                    <\/code>?><\/code>\" value=\"<\/code><?php<\/code>                    <\/code>echo<\/code>esc_attr(<\/code>$value<\/code>)<\/code>                    <\/code>?>\"\/><\/code>                    <\/code><div id=<\/code>\"wpb-category-image-preview\"<\/code>style=<\/code>\"max-width: 150px; max-height: 150px;\"<\/code>><?php<\/code>                        <\/code>echo<\/code>$image<\/code>;<\/code>                        <\/code>?><\/div><\/code>                    <\/code><input id=<\/code>\"upload_image_button\"<\/code>class<\/code>=<\/code>\"button\"<\/code>type=<\/code>\"button\"<\/code>value=<\/code>\"Upload Image\"<\/code>\/><\/code>                <\/code><\/label><\/code>                <\/code><p <\/code>class<\/code>=<\/code>\"description\"<\/code>>Enter a URL <\/code>or<\/code>upload an image<\/p><\/code>            <\/code><\/td><\/code>        <\/code><\/tr><\/code>        <\/code><?php<\/code>        <\/code>wp_nonce_field(<\/code>$this<\/code>->nonceId, <\/code>$this<\/code>->nonceId);<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>saveTerm(<\/code>$term_id<\/code>, <\/code>$tt_id<\/code>)<\/code>    <\/code>{<\/code>        <\/code>$data<\/code>= <\/code>array_filter<\/code>(wp_unslash(<\/code>$_POST<\/code>), <\/code>function<\/code>(<\/code>$value<\/code>, <\/code>$key<\/code>) {<\/code>            <\/code>return<\/code>in_array(<\/code>$key<\/code>, [<\/code>$this<\/code>->nonceId, <\/code>$this<\/code>->fieldId]);<\/code>        <\/code>}, ARRAY_FILTER_USE_BOTH);<\/code>        <\/code>if<\/code>(<\/code>            <\/code>empty<\/code>(<\/code>$data<\/code>) ||<\/code>            <\/code>empty<\/code>(<\/code>$data<\/code>[<\/code>$this<\/code>->nonceId]) ||<\/code>            <\/code>! wp_verify_nonce(<\/code>$data<\/code>[<\/code>$this<\/code>->nonceId], <\/code>$this<\/code>->nonceId) ||<\/code>            <\/code>! current_user_can(<\/code>'manage_categories'<\/code>)<\/code>        <\/code>) {<\/code>            <\/code>return<\/code>null;<\/code>        <\/code>}<\/code>        <\/code>if<\/code>(<\/code>empty<\/code>(<\/code>$data<\/code>[<\/code>$this<\/code>->fieldId]) || <\/code>empty<\/code>(absint(<\/code>$data<\/code>[<\/code>$this<\/code>->fieldId]))) {<\/code>            <\/code>return<\/code>delete_term_meta(<\/code>$term_id<\/code>, <\/code>$this<\/code>->fieldId);<\/code>        <\/code>}<\/code>        <\/code>$value<\/code>= absint(<\/code>$data<\/code>[<\/code>$this<\/code>->fieldId]);<\/code>        <\/code>return<\/code>update_term_meta(<\/code>$term_id<\/code>, <\/code>$this<\/code>->fieldId, <\/code>$value<\/code>);<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>editTerm(<\/code>$term_id<\/code>, <\/code>$tt_id<\/code>)<\/code>    <\/code>{<\/code>        <\/code>$this<\/code>->saveTerm(<\/code>$term_id<\/code>, <\/code>$tt_id<\/code>);<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>fallback(<\/code>$null<\/code>, <\/code>$object_id<\/code>, <\/code>$meta_key<\/code>, <\/code>$single<\/code>, <\/code>$meta_type<\/code>)<\/code>    <\/code>{<\/code>        <\/code>if<\/code>(<\/code>            <\/code>$null<\/code>=== null &&<\/code>            <\/code>$meta_key<\/code>=== <\/code>'_thumbnail_id'<\/code>        <\/code>) {<\/code>            <\/code>$meta_cache<\/code>= wp_cache_get(<\/code>$object_id<\/code>, <\/code>$meta_type<\/code>. <\/code>'_meta'<\/code>);<\/code>            <\/code>if<\/code>( ! <\/code>$meta_cache<\/code>) {<\/code>                <\/code>$meta_cache<\/code>= update_meta_cache(<\/code>$meta_type<\/code>, [<\/code>$object_id<\/code>]);<\/code>                <\/code>$meta_cache<\/code>= <\/code>$meta_cache<\/code>[<\/code>$object_id<\/code>] ?? null;<\/code>            <\/code>}<\/code>            <\/code>$val<\/code>= null;<\/code>            <\/code>if<\/code>(isset(<\/code>$meta_cache<\/code>[<\/code>$meta_key<\/code>])) {<\/code>                <\/code>if<\/code>(<\/code>$single<\/code>) {<\/code>                    <\/code>$val<\/code>= maybe_unserialize(<\/code>$meta_cache<\/code>[<\/code>$meta_key<\/code>][0]);<\/code>                <\/code>} <\/code>else<\/code>{<\/code>                    <\/code>$val<\/code>= <\/code>array_map<\/code>(<\/code>'maybe_unserialize'<\/code>, <\/code>$meta_cache<\/code>[<\/code>$meta_key<\/code>]);<\/code>                <\/code>}<\/code>            <\/code>}<\/code>            <\/code>if<\/code>(<\/code>empty<\/code>(<\/code>$val<\/code>)) {<\/code>                <\/code>$fallbackImageId<\/code>= <\/code>$this<\/code>->getPostFallbackImageId(<\/code>$object_id<\/code>, <\/code>$single<\/code>);<\/code>                <\/code>if<\/code>( ! <\/code>empty<\/code>(<\/code>$fallbackImageId<\/code>)) {<\/code>                    <\/code>return<\/code>$fallbackImageId<\/code>;<\/code>                <\/code>}<\/code>            <\/code>}<\/code>            <\/code>return<\/code>$val<\/code>;<\/code>        <\/code>}<\/code>        <\/code>return<\/code>$null<\/code>;<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>getPostFallbackImageId(<\/code>$postId<\/code>, <\/code>$single<\/code>)<\/code>    <\/code>{<\/code>        <\/code>$terms<\/code>= get_the_terms(<\/code>$postId<\/code>, <\/code>$this<\/code>->taxonomy);<\/code>        <\/code>if<\/code>(<\/code>empty<\/code>(<\/code>$terms<\/code>) || is_wp_error(<\/code>$terms<\/code>)) {<\/code>            <\/code>return<\/code>null;<\/code>        <\/code>}<\/code>        <\/code>foreach<\/code>(<\/code>$terms<\/code>as<\/code>$term<\/code>) {<\/code>            <\/code>$fallbackIdFromCategoryId<\/code>= get_term_meta(<\/code>$term<\/code>->term_id, <\/code>$this<\/code>->fieldId, <\/code>$single<\/code>);<\/code>            <\/code>if<\/code>( ! <\/code>empty<\/code>(<\/code>$fallbackIdFromCategoryId<\/code>)) {<\/code>                <\/code>return<\/code>$fallbackIdFromCategoryId<\/code>;<\/code>            <\/code>}<\/code>        <\/code>}<\/code>        <\/code>return<\/code>null;<\/code>    <\/code>}<\/code>    <\/code>public<\/code>function<\/code>inlineScript()<\/code>    <\/code>{<\/code>        <\/code>return<\/code>\"jQuery(document).ready(<\/code>function<\/code>($) {<\/code>            <\/code>var<\/code>custom_uploader;<\/code>            <\/code>$(<\/code>'#upload_image_button'<\/code>).click(<\/code>function<\/code>(e) {<\/code>                <\/code>e.preventDefault();<\/code>                <\/code>\/\/If the uploader object has already been created, reopen the dialog<\/code>                <\/code>if<\/code>(custom_uploader) {<\/code>                    <\/code>custom_uploader.open();<\/code>                    <\/code>return<\/code>;<\/code>                <\/code>}<\/code>                <\/code>\/\/Extend the wp.media object<\/code>                <\/code>custom_uploader = wp.media.frames.file_frame = wp.media({<\/code>                    <\/code>title: <\/code>'Choose Image'<\/code>,<\/code>                    <\/code>button: {<\/code>                        <\/code>text: <\/code>'Choose Image'<\/code>                    <\/code>},<\/code>                    <\/code>multiple: true<\/code>                <\/code>});<\/code>                <\/code>\/\/When a file is selected, grab the URL and set it as the text field's value<\/code>                <\/code>custom_uploader.on(<\/code>'select'<\/code>, <\/code>function<\/code>() {<\/code>                    <\/code>console.log(custom_uploader.state().get(<\/code>'selection'<\/code>).toJSON());<\/code>                    <\/code>attachment = custom_uploader.state().get(<\/code>'selection'<\/code>).first().toJSON();<\/code>                    <\/code>                    <\/code>var<\/code>thumbUrl = attachment && attachment.sizes && attachment.sizes.thumbnail && attachment.sizes.thumbnail.url<\/code>                    <\/code>? attachment.sizes.thumbnail.url<\/code>                    <\/code>: attachment.url;<\/code>                    <\/code>$(<\/code>'#wpb-category-image-preview'<\/code>).html(<\/code>'<img src=\\\"'<\/code>+ thumbUrl +<\/code>'\\\">'<\/code>);<\/code>                    <\/code>$(<\/code>'#upload_image'<\/code>).val(attachment.id);<\/code>                <\/code>});<\/code>                <\/code>\/\/Open the uploader dialog<\/code>                <\/code>custom_uploader.open();<\/code>            <\/code>});<\/code>        <\/code>});\";<\/code>    <\/code>}<\/code>}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u7531<\/p>\n\n\n\n

WPCode\u4e0e \u2764\ufe0f \u4e3b\u529e<\/a><\/strong><\/p>\n\n\n\n

\u5728 WordPress \u4e2d\u4e00\u952e\u4f7f\u7528<\/a><\/p>\n\n\n\n

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\"\u9009\u62e9\u540e\u5907\u56fe\u50cf\u63d2\u5165\u9009\u9879\"<\/figure>\n\n\n\n

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\"\u4fdd\u5b58\u5e76\u6fc0\u6d3b\u4ee3\u7801\u7247\u6bb5<\/figure>\n\n\n\n

\u60a8\u53ef\u80fd\u8fd8\u60f3\u67e5\u770b\u6211\u4eec\u6709\u5173\u5982\u4f55\u5728 WordPress \u4e2d\u6dfb\u52a0\u81ea\u5b9a\u4e49\u4ee3\u7801\u7247\u6bb5\u7684<\/a>\u6307\u5357\u3002<\/p>\n\n\n\n

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1<\/td>protected<\/code>static<\/code>$taxonomies<\/code>= [<\/code>'category'<\/code>];<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u7531<\/p>\n\n\n\n

WPCode\u4e0e \u2764\ufe0f \u4e3b\u529e<\/a><\/strong><\/p>\n\n\n\n

\u5728 WordPress \u4e2d\u4e00\u952e\u4f7f\u7528<\/a><\/p>\n\n\n\n

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\"\u540e\u5907\u56fe\u50cf\u9884\u89c8\"<\/figure>\n\n\n\n

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