注意:试图访问第83行bool类型值的数组偏移量

Question

刚刚在Php 7.4中打开调试模式后注意到这一点。有几个问题是相关的，但没有一个得到了支持。很想为那些在7.4 WP 中也会遇到同样问题的人提供一个像样的答案

这些行显示：

// Get image size after cropping.
$dims = image_resize_dimensions( $orig_w, $orig_h, $width, $height, $crop );
$dst_w = $dims[4];
$dst_h = $dims[5];
// Return the original image only if it exactly fits the needed measures.
if ( ! $dims && ( ( ( null === $height && $orig_w == $width ) xor ( null === $width && $orig_h == $height ) ) xor ( $height == $orig_h && $width == $orig_w ) ) ) {
$img_url = $url;
$dst_w = $orig_w;
$dst_h = $orig_h;
} else {
// Use this to check if cropped image already exists, so we can return that instead.
$suffix = "{$dst_w}x{$dst_h}";
$dst_rel_path = str_replace( '.' . $ext, '', $rel_path );
$destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";
if ( ! $dims || ( true == $crop && false == $upscale && ( $dst_w < $width || $dst_h < $height ) ) ) {
// Can't resize, so return false saying that the action to do could not be processed as planned.
return false;
}
// Else check if cache exists.
elseif ( file_exists( $destfilename ) && getimagesize( $destfilename ) ) {
$img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
}
// Else, we resize the image and return the new resized image url.
else {
$editor = wp_get_image_editor( $img_path );
if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
return false;
$resized_file = $editor->save();
if ( ! is_wp_error( $resized_file ) ) {
$resized_rel_path = str_replace( $upload_dir, '', $resized_file['path'] );
$img_url = $upload_url . $resized_rel_path;
} else {
return false;
}
}
}

解析的代码如下所示：-如批准答案的注释中所述，声明词$dst_w&dst_h已被放入else语句中。

// Get image size after cropping.
$dims = image_resize_dimensions( $orig_w, $orig_h, $width, $height, $crop );
// Return the original image only if it exactly fits the needed measures.
if ( ! $dims && ( ( ( null === $height && $orig_w == $width ) xor ( null === $width && $orig_h == $height ) ) xor ( $height == $orig_h && $width == $orig_w ) ) ) {
$img_url = $url;
$dst_w = $orig_w;
$dst_h = $orig_h;
} else {
// Use this to check if cropped image already exists, so we can return that instead.
$suffix = "{$dst_w}x{$dst_h}";
$dst_rel_path = str_replace( '.' . $ext, '', $rel_path );
$destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";
$dst_w = $dims[4];
$dst_h = $dims[5];
if ( ! $dims || ( true == $crop && false == $upscale && ( $dst_w < $width || $dst_h < $height ) ) ) {
// Can't resize, so return false saying that the action to do could not be processed as planned.
return false;
}
// Else check if cache exists.
elseif ( file_exists( $destfilename ) && getimagesize( $destfilename ) ) {
$img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
}
// Else, we resize the image and return the new resized image url.
else {
$editor = wp_get_image_editor( $img_path );
if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
return false;
$resized_file = $editor->save();
if ( ! is_wp_error( $resized_file ) ) {
$resized_rel_path = str_replace( $upload_dir, '', $resized_file['path'] );
$img_url = $upload_url . $resized_rel_path;
} else {
return false;
}
}
}

Answer 1

注意到$dims不是一个数组，而是一个布尔值，可能是因为image_resize_dimensions失败并返回false。

如果，image_resize_dimensions返回false

• 原始大小为0或更小
• 带有和高度的目标都为0/未指定
• 原始大小等于目标大小(在这种情况下，不需要调整图像大小(

在尝试访问$dims[4]和$dims[5]之前，应检查$dims是否为false。