今天有个站长好朋友来求助，他的网站使用Justnews的主题，他对主题各方面比较满意，就是很不喜欢它会一直主动裁切生成缩略图。
他说他折腾了很久，用了很常见的WP禁止缩略图的方法也无用。即便是删除了还会自动再生成，这让他很恼火，这才找到我帮忙。
我大概看了一下这个主题的结构，目前的解决方法是，先主题目录下这个文件：functions.php，接着找到这段代码，然后删除：
add_filter('wpcom_image_sizes', 'justnews_image_sizes', 20);
function justnews_image_sizes($image_sizes){
global $options;
if(!isset($options['thumb_default_width'])){
$image_sizes['post-thumbnail'] = array(
'width' => 480,
'height' => 300
);
}
return $image_sizes;
}
然后在这个位置加一段禁止代码：
// 完全禁止 WordPress 生成任何尺寸的缩略图
function disable_all_image_sizes( $sizes ) {
return array(); // 返回空数组，阻止所有中间尺寸生成
}
add_filter( 'intermediate_image_sizes_advanced', 'disable_all_image_sizes', 999 );
// 移除所有已注册的图片尺寸
function remove_all_image_sizes() {
// 移除默认尺寸
remove_image_size( 'thumbnail' );
remove_image_size( 'medium' );
remove_image_size( 'medium_large' );
remove_image_size( 'large' );
// 移除主题或插件添加的自定义尺寸
foreach ( get_intermediate_image_sizes() as $size ) {
remove_image_size( $size );
}
}
add_action( 'init', 'remove_all_image_sizes', 999 );
然后再找到主题的路径的这个文件：\themer\includes\aq-resizer.php，然后把以下改好的代码替换掉：
<?php
/**
* Title : Aqua Resizer
* Description : Resizes WordPress images on the fly
* Version : 1.2.1
* Author : Syamil MJ
* Author URI : http://aquagraphite.com
* License : WTFPL - http://sam.zoy.org/wtfpl/
* Documentation : https://github.com/sy4mil/Aqua-Resizer/
*
* @param string $url - (required) must be uploaded using wp media uploader
* @param int $width - (required)
* @param int $height - (optional)
* @param bool $crop - (optional) default to soft crop
* @param bool $single - (optional) returns an array if false
* @param bool $upscale - (optional) resizes smaller images
* @uses wp_upload_dir()
* @uses image_resize_dimensions()
* @uses wp_get_image_editor()
*
* @return str|array
*/
defined( 'ABSPATH' ) || exit;
if(!class_exists('WPCOM_Resize')) {
class WPCOM_Exception extends Exception {}
class WPCOM_Resize
{
/**
* The singleton instance
*/
static private $instance = null;
/**
* Should an WPCOM_Exception be thrown on error?
* If false (default), then the error will just be logged.
*/
public $throwOnError = false;
/**
* No initialization allowed
*/
private function __construct() {}
/**
* No cloning allowed
*/
private function __clone() {}
/**
* For your custom default usage you may want to initialize an WPCOM_Resize object by yourself and then have own defaults
*/
static public function getInstance() {
if(self::$instance == null) {
self::$instance = new self;
}
return self::$instance;
}
/**
* Run, forest.
*/
public function process( $url, $width = null, $height = null, $crop = null, $img_id = 0, $size = '', $single = true, $upscale = false ) {
try {
// Validate inputs.
if (!$url)
throw new WPCOM_Exception('$url parameter is required');
if (!$width)
throw new WPCOM_Exception('$width parameter is required');
// Caipt'n, ready to hook.
if ( true === $upscale ) add_filter( 'image_resize_dimensions', array($this, 'aq_upscale'), 10, 6 );
// Define upload path & dir.
$upload_info = wp_upload_dir();
$upload_dir = $upload_info['basedir'];
$upload_url = $upload_info['baseurl'];
$http_prefix = "http://";
$https_prefix = "https://";
$relative_prefix = "//"; // The protocol-relative URL
// 匹配本地绝对路径图片，并补充成完整地址
if(preg_match('/^\/[^\/].*/i', $url) && preg_match('/(http:|https:)\/\/([^\/]+)/i', get_bloginfo('url'), $mc)){
if($mc && $mc[0]){
$url = $mc[0] . $url;
}
}
/* if the $url scheme differs from $upload_url scheme, make them match
if the schemes differe, images don't show up. */
if(!strncmp($url,$https_prefix,strlen($https_prefix))){ //if url begins with https:// make $upload_url begin with https:// as well
$upload_url = str_replace($http_prefix,$https_prefix,$upload_url);
}
elseif(!strncmp($url,$http_prefix,strlen($http_prefix))){ //if url begins with http:// make $upload_url begin with http:// as well
$upload_url = str_replace($https_prefix,$http_prefix,$upload_url);
}
elseif(!strncmp($url,$relative_prefix,strlen($relative_prefix))){ //if url begins with // make $upload_url begin with // as well
$upload_url = str_replace(array( 0 => "$http_prefix", 1 => "$https_prefix"),$relative_prefix,$upload_url);
}
// Check if $img_url is local.
if ( false === strpos( $url, $upload_url ) )
return false;
// oss路径的图片使用oss图片服务返回
if ( preg_match('/^oss:\/\//i', $upload_dir) || class_exists('WPOSS') ) {
$size = 'image/resize,m_fill,w_'.$width;
if($height) $size .= ',h_'.$height;
$size .= ',limit_0';
if ( $single ) {
$image = add_query_arg(array('x-oss-process' => $size), $url);
} else {
$image = array (
0 => add_query_arg(array('x-oss-process' => $size), $url),
1 => $width,
2 => $height
);
}
return $image;
}else if( (function_exists('wpcos_unique_filename') || defined('TENCENT_WORDPRESS_COS_VERSION')) && !preg_match('/imageMogr2\//i', $upload_dir)) {
$size = 'imageMogr2/crop/'.$width.'x';
if($height) $size .= $height;
$size .= '/gravity/center';
if ( $single ) {
$image = add_query_arg(array($size => ''), $url);
} else {
$image = array (
0 => add_query_arg(array($size => ''), $url),
1 => $width,
2 => $height
);
}
return $image;
}else if( class_exists('WPQiNiu') && !preg_match('/imageMogr2\//i', $upload_dir)) {
if($height) {
$size = 'imageMogr2/thumbnail/!'.$width.'x'.$height.'r|imageMogr2/gravity/center/crop/'.$width.'x'.$height;
}else{
$size = 'imageMogr2/thumbnail/'.$width.'x';
}
if ( $single ) {
$image = add_query_arg(array($size => ''), $url);
} else {
$image = array (
0 => add_query_arg(array($size => ''), $url),
1 => $width,
2 => $height
);
}
return $image;
}else if(function_exists('wpupyun_unique_filename')){
if($height) {
$size = '!/both/'.$width.'x'.$height;
}else{
$size = '!/fw/'.$width;
}
if ( $single ) {
$image = $url . $size;
} else {
$image = array (
0 => $url . $size,
1 => $width,
2 => $height
);
}
return $image;
}
// Return the original image URL
if ( $single ) {
$image = $url;
} else {
list( $orig_w, $orig_h ) = getimagesize( str_replace( $upload_url, $upload_dir, $url ) );
$image = array (
0 => $url,
1 => $orig_w,
2 => $orig_h
);
}
// Okay, leave the ship.
if ( true === $upscale ) remove_filter( 'image_resize_dimensions', array( $this, 'aq_upscale' ) );
return $image;
}
catch (WPCOM_Exception $ex) {
//error_log('WPCOM_Resize.process() error: ' . $ex->getMessage());
if ($this->throwOnError) {
// Bubble up exception.
throw $ex;
}
else {
// Return false, so that this patch is backwards-compatible.
return false;
}
}
}
/**
* Callback to overwrite WP computing of thumbnail measures
*/
function aq_upscale( $default, $orig_w, $orig_h, $dest_w, $dest_h, $crop ) {
if ( ! $crop ) return null; // Let the wordpress default function handle this.
// Here is the point we allow to use larger image size than the original one.
$aspect_ratio = $orig_w / $orig_h;
$new_w = $dest_w;
$new_h = $dest_h;
if ( ! $new_w ) {
$new_w = intval( $new_h * $aspect_ratio );
}
if ( ! $new_h ) {
$new_h = intval( $new_w / $aspect_ratio );
}
$size_ratio = max( $new_w / $orig_w, $new_h / $orig_h );
$crop_w = round( $new_w / $size_ratio );
$crop_h = round( $new_h / $size_ratio );
$crop = apply_filters('wpcom_image_crop_position', $crop);
if ( ! is_array( $crop ) || count( $crop ) !== 2 ) {
$crop = array( 'center', 'center' );
}
list( $x, $y ) = $crop;
if ( 'left' === $x ) {
$s_x = 0;
} elseif ( 'right' === $x ) {
$s_x = $orig_w - $crop_w;
} else {
$s_x = floor( ( $orig_w - $crop_w ) / 2 );
}
if ( 'top' === $y ) {
$s_y = 0;
} elseif ( 'bottom' === $y ) {
$s_y = $orig_h - $crop_h;
} else {
$s_y = floor( ( $orig_h - $crop_h ) / 2 );
}
return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
}
}
}
if(!function_exists('wpcom_resize')) {
/**
* This is just a tiny wrapper function for the class above so that there is no
* need to change any code in your own WP themes. Usage is still the same :)
*/
function wpcom_resize( $url, $width = null, $height = null, $crop = null, $single = true, $upscale = false ) {
/* WPML Fix */
if ( defined( 'ICL_SITEPRESS_VERSION' ) ){
global $sitepress;
$url = $sitepress->convert_url( $url, $sitepress->get_default_language() );
}
/* WPML Fix */
$aq_resize = WPCOM_Resize::getInstance();
return $aq_resize->process( $url, $width, $height, $crop, $single, $upscale );
}
}
如此，便能基本上解决这个主题会为每张图片自动裁切480X320像素的缩略图了。
当然了，还有涉及到其他文件要修改，但是没必要，因为改多错多，能用就可以了。
题外话，其实有很多站长都很不喜欢图片被各种裁切。
在WP主题使用的过程中，在主题加入一个大图自适应尺寸的参数，这才是更受站长们喜欢的一种图片展示方式。
THE END
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