How to display continuous values in groups? Please give me guidance and help from teachers.

Question

It's not a database operation, it's a php operation. For example: $a="1,2,3,4,5,6,7,8,9,10,11"$b="8,9,10,11,12,13,17,18,19, 20"$c="10,11,12,13,14,15,16,18,20,21,22,23,24"Required results$a="1-11"$b="8-13 ,17-20"$

一锤一座山 · Answer

Let’s be a bit stupid and split it first $strList = explode(",",$str);

After that, we can loop from the first or last one and compare 1 and -1.

When not equal, output the start bit and end bit, and then continue to the next step of the cycle.

You can also use recursion.