Simple PHP Text To Excel Output Script Needed - NO DATABASE REQUIRED

I need a php script created so that I can enter a bulk amount of strings of numbers that look like: 123456789123 349374384748 587584758947 497587598579 222453984098 The strings of numbers will always be 12 digits in length and the output files need to be in .xls file format. This is important information because of how excel treats long strings of numbers and it must retain the whole number without any decimal point. Here's how the script will need to function: 1. I enter an example list of 5000 of the 12-digit strings of numbers in the bulk input field. 2. I select how many strings of numbers I would like per file. The options will be 5, 10, 25, 50, 75, 100, 200, 300, 500, 750, 1000, 1250, 1500, 2000, 2500, 5000, 7500, 10000, 15000 and 25000. (Also, must be easy to add any additional options) 3. Lets imagine I chose the 100 option and then I click submit. Since I entered a list of 5000, the script's function will convert the list into 50 files containing 100 numbers each from the list provided in the input bulk field. Once the script has completed the process it will prompt me to download the zip file containing all of the files inside. The file names should be [login to view URL], [login to view URL] [login to view URL], [login to view URL] and so forth. It is EXTREMELY important that the script is 100% accurate as all of the input numbers will be 100% unique from one another and cannot be duplicated or added to another file. Upon opening any of the generated .xls files, there must be whole numbers within each file, no decimal points on any of the strings of numbers will be allowed. By default, if you enter a list of 12 digit numbers into an excel file, it look like this: Input: 123456789123 Output: 1.23457E+11 The script must display the number strings within the .xls file the same way as the identical input. Since the input file will never change from 12 digits in length, this is a matter of a simple setting within your script. Also the output of the .xls file MUST BE in .xls, not .xlsx or anything else. It needs to be the same as this: Excel 97-04 Workbook (.xls) I need this script completed within 24-48 hours and i'm ready to hire ASAP. If contacting me, please put keyword: pantalones in your message, so that I know you read everything of the project here. Please have at least a few feedbacks prior to bidding and make sure you read and understand the entire project prior to bidding. Please bid $250 or less to be considered for this project. I am a programmer as well and know exactly how much work it takes to program a simple php script such as this. If you have any questions, please let me know and I can clarify. I'm looking to hire ASAP for this project. Thank you!