How can i implement a code like this ?

I already have the peeps.txt . I tried coding this but i'm getting endless loop

Write the PHP code for a web page that searches for names that contain a given letter a given number of times, case-insensitively. Your web service would be located in a file named q4.php on the server. In this same directory is a file peeps.txt; each line of this file contains a name. For example: Helene Martin Robert Purple Marty Stepp Stuart Reges Bob Loblaw The names are guaranteed to be non-empty and unique Your web service accepts a query parameter named letter indicating the character to be searched for, and a parameter named times indicating how many times that character must occur, case-insensitively. For each name that contains the letterat least the given number of times, an HTML paragraph should be printed indicating