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<?php
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if( !defined( 'THEME_THUMBNAIL_PATH' ) ) define( 'THEME_THUMBNAIL_PATH', '/cache/theme-thumbnail' ); //存储目录
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function biji_build_empty_index( $path ){ //生成空白首页
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$index = $path . '/index.php';
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if( is_file( $index ) ) return;
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wp_mkdir_p( $path );
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file_put_contents( $index, "<?phpn// Silence is golden.n" );
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}
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function biji_crop_thumbnail( $url, $width, $height = null ){ //裁剪图片
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$width = (int) $width;
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$height = empty( $height ) ? $width : (int) $height;
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$hash = md5( $url );
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$file_path = constant( 'WP_CONTENT_DIR' ) . constant( 'THEME_THUMBNAIL_PATH' ) . "/$hash-$width-$height.jpg";
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$file_url = content_url( constant( 'THEME_THUMBNAIL_PATH' ) . "/$hash-$width-$height.jpg" );
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if( is_file( $file_path ) ) return $file_url;
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$editor = wp_get_image_editor( $url );
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if( is_wp_error( $editor ) ) return $url;
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$size = $editor->get_size();
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$dims = image_resize_dimensions( $size['width'], $size['height'], $width, $height, true );
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//if( !$dims ) return $url;
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$cmp = min( $size['width'] / $width, $size['height'] / $height );
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if( is_wp_error( $editor->crop( $dims[2], $dims[3], $width * $cmp, $height * $cmp, $width, $height ) ) ) return $url;
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biji_build_empty_index( constant( 'WP_CONTENT_DIR' ) . constant( 'THEME_THUMBNAIL_PATH' ) );
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return is_wp_error( $editor->save( $file_path, 'image/jpg' ) ) ? $url : $file_url;
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}
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//缩略图获取post_thumbnail
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function post_thumbnail($width = 275,$height = 170 )
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{
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global $post;
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//如果有特色图片则取特色图片
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if( has_post_thumbnail( $post->ID ) ){
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$thumbnail_ID = get_post_thumbnail_id( $post->ID );
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$thumbnailsrc = wp_get_attachment_image_src( $thumbnail_ID, 'full' );
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return biji_crop_thumbnail($thumbnailsrc[0],$width,$height);
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} else {
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$content = $post->post_content;
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preg_match_all('/<img.*?(?: |\t|\r|\n)?src=['"]?(.+?)['"]?(?:(?: |\t|\r|\n)+.*?)? >/sim', $content, $strResult, PREG_PATTERN_ORDER);
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if(count($strResult[1]) > 0) return biji_crop_thumbnail($strResult[1][0],$width,$height);
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else{
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return false;
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}
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}
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}
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?>
在调用时，可以这样调用：
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<?php if (post_thumbnail(110, 110)){ ?>
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<img src="<?php echo post_thumbnail(110, 110); ?>" srcset="<?php echo post_thumbnail(220, 220); ?> 2x"/>
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<?php }else{
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echo '<i class="icon-file-text2"></i>';
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}?>
admin 
