Generating Histogram Colour Analysis Graphs From Images In PHP
If you've ever looked at the settings in a digital camera, or have experience with image processing programs like GIMP, then you may have seen a colour histogram. This is a simple graph that shows the amount of different shades of colour are present in the image.
PHP:CSI - To Switch, Or Not To Switch?
I was writing unit tests for a API mapping function recently and came across this interesting issue. The code I was writing tests for was in a legacy codebase that I was making changes to, and it made sense to have some unit tests in there before I started work to ensure everything worked before and after.
Drupal 9: Generating Header Images For Pages Of Content Using PHP
Embedding image within pages of content helps both within the design of the page and when shared on social media. If you set up meta tags to point at a particular image then that image will appear when the page is shared on social media. This makes your page stand out more.
Using PSR-4 With Composer
The PHP Standards Recommendations (called PSR) are a set of standards that aim to make certain aspects of working with PHP easier.
Generating A PDF From A Web Page Using PHP And Chrome
Generating a PDF document from a web page through PHP can be problematic. It's often something that seems quite simple, but actually generating the document can be difficult and time consuming.
PHP:CSI - Date Is Less Than One Month Ago
Working with logic surrounding dates can sometimes be difficult and it's fairly common to come across really subtle date and time based bugs.
I was recently shown a bug in a PHP application that looks like it should be working at face value, but doesn't actually produce the correct result.
Why do you count right as count($array) - 1. Why do you need this -1 ?
Submitted by Valeriy on Mon, 03/30/2020 - 12:27Permalink
This is because the count() function will return the length of the array, but if we want to get the last item in the array using this value it will be 1 item beyond the end of the array.
The array I'm creating here starts from 0 so although the length is 10, the index of the last item is 9.
Submitted by philipnorton42 on Tue, 03/31/2020 - 15:17Permalink
A good binary search implementation does not return NULL if element is not found. It should return the correct insertion index for the element instead. This way it can serve both purposes (retrieval and insertion), because it only costs O(1) to check if the element at the returned index is the needle.
Submitted by BASTA! on Sun, 06/20/2021 - 21:03Permalink
That's actually a really good point. I initially though "how would you know if the value was not found versus a found index", but you are right in that you would only need to go and check the index for the return value. I might have another go at this.
Thank you for the comment!
Submitted by philipnorton42 on Mon, 06/21/2021 - 08:37Permalink
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