Notice at last line of code and I tried preg_split(":\",$fline) instead of split in but still I can see same notice
<?php
$file = fopen("employees.txt","r");
    $under_40=0;
    $salary_sum=0; 
    $emplist=[];
    $total_employees=0;
    echo "Names of all employees whose names end with son : <br/>";
    while(! feof($file))
      {
        $total_employees++;
        $fline=fgets($file);
list($name,$age,$dept,$salary)=split(':',$fline);
