how to convert line by line or array to string with seperator

how to convert line by line or array to string with seperator
array to string
<?php
$names = array ('rafiquee', 'sameer', 'azamm');
echo implode(', ', $names);	rafiquee, sameer, azamm
?>
file line by line to string
<php
$file = file('names.txt' );	presently the data is in line by line
$file_string = implode(',',  $file);	vamsi
echo $file_strting;	rafiquee ,vamsi ,krishna
?>	we not given space, white s[pace is created
<?php	load the data like a array, before load remove space
$file = file('names.txt');	in namestext file data is in line by line
$c = 0;	assign 0 to c
foreach($file as $name){	using for each  go to each and every line of file
$names_array[$c] = trim($name);	trim the name without space and assign to names array in line by line
$c++;
}
	convert line by line to string with seperatros
$names_string =  implode(',', $names_array);	vamsi, krishna, simha
echo $names_string;	right side is fiule and left side is seperator
?>
array implode file implode file foreach trim c++ implode
how to create a array and how to conver that to string how to print that string how to read the file which has data is in line by line how to convert line by line data to string  how to print the data in file how to over come,It prints some unnecessaary space how to select the file how to print the array file convert to string without unnecessary spaces