如何提取变量的值并重复使用该值直到被覆盖

Question

I have a website which essentially acts as a blog / photo gallery. It comprises PHP and MYSQL. My objective is to be able to set an image on my homeimage dynamically. I have set up a form which posts a variable (which contains the relevent image filename) to my homepage file. I pick this up using the $_POST method. This works fine, but only until I refresh the homepage at which point the variable is no longer there and so, understandably, the image is no longer called. Can anyone explain how I can store the variable value i.e. the image filename, so that it can be used until such time as it is overwritten by a new image. I have tried setting up a function that returns the value, but I can't seem to hold on to it!! Any guidance would be much appreciated.

Answer 1

Well, you can do multiple things :

• Store it using MySQL. Create a table that will named "configuration" for example, with one field named "homepageImage" for example. When you want to modify the image on the homepage, just update this field. When you want to get the image, just query this table and fetch this field.
• Store it in a file on your server. You just have to overwrite the file with the new filename inside it when you want to change the image. Fetch the content of the file when you want to display the image
• Create a symbolic link (pointing to the right image), and update the link every time you want to change the image. When you want to display the image, just put the name of the link in your img tag