Hướng dẫn dùng line shuffler trong PHP

I am trying to read, shuffle, then display the contents of a text file. The text file contains a list of codes [each one on a new line - no commas etc].

1490
1491
1727
364
466
//...
783
784
786

My code:

$file = fopen["keywords.txt", "r"];
shuffle[$file];

while [!feof[$file]] {
  echo "new featuredProduct['', ". "'". urlencode[trim[fgets[$file]]] ."']" . "," . "\n
";
}

fclose[$file];

The result I get is the following:

new featuredProduct['', '1490'], 
new featuredProduct['', '1491'], 
new featuredProduct['', '1727'], 
new featuredProduct['', '364'], 
new featuredProduct['', '466'], 
//... 
new featuredProduct['', '783'], 
new featuredProduct['', '784'], 
new featuredProduct['', '786'], 

I believed that I would have to shuffle the contents of the $file variable before looping through and displaying, and as you can see, the shuffle function is not working or I have not used it correctly?

I was expecting to see the list arranged a lot more randomly.