A class for php to generate thumbnails

12 Jul 2016

php resizeimage failed to generate thumbnails for some jpg files. php resizeimage failed to generate thumbnails for some jpg files. Today, when I encountered GD's resizeimage function to process the thumbnails of jpg suffix files, it prompted that the image was not a legal jpg image and reported an error.

07 Feb 2026

This article describes how to use Jackson's @JsonTypeInfo and @JsonTypeName to implement the serialization of the generic Wrapper class, so that different subtypes (such as PayloadFoo, PayloadBar) are automatically mapped to corresponding field names (such as "foo", "bar"), and a nested JSON structure that complies with SOA specifications is generated.

27 Nov 2025

First, dynamically obtain the URL, update time and other information of the published content from the database, then generate a compliant XML file according to the Sitemap protocol, set the correct header and encoding, limit a single file to 50,000 URLs and use caching or scheduled tasks to improve performance, and finally submit it to the search engine and ensure that it can be accessed through robots.txt.

31 Jan 2026

This article explains how to correctly pass the unique ID of each record to the target page through URL parameters in the PHP foreach loop to avoid the problem of all links pointing to the last piece of data due to variable overwriting or incorrect use of Session.

08 Mar 2026

This article describes how to use PHP's DateTime and DatePeriod classes to accurately generate all dates on fixed days of the week (such as every Wednesday) from the start day to the end day, and solve the problem of returning null values ​​due to variable scope.

24 Mar 2026

This article explains in detail how to batch import CSV files into MySQL in PHP, dynamically generate a unique QR code for each record, and write the code value and data into the database together. Complete runnable code and security precautions are attached.