如何将长串数字从CSV文件转换为数组？

I have a CSV file with around 800 number of 5 digits each. I want to create an array with each element being one number of five digits. I am not very proficient in Excel, but I copied the list of numbers and created a string of the number. However, because I copied if from an Excel file, when I pasted it into my PHP code, it pasted one number per line, creating a string that is ~800 lines long. That is fine, but now that I want to create the array using the I have a CSV file with around 800 number of 5 d