回答編集履歴
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\$wpdb使用例追記
test
CHANGED
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@@ -23,3 +23,21 @@
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```
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追記：
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$wpdbを使う場合はこのような感じです。
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```PHP
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$sql = "SELECT ID FROM $wpdb->posts WHERE `post_type` LIKE 'attachment' AND `guid` LIKE '" . $image_uri . "'";
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$id = $wpdb->get_var($wpdb->prepare($sql));
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echo get_attachment_link($id);
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```
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