如何在PHP只有1 GB内存的虚拟专用服务器上迭代4GB CSV文件？

So my case is like this:

I do have a CSV 4GB comma separated value file and my virtual private server has only 1 GB of memory dedicated to PHP.

My question is this:

Is there any way to allocate memory for only one CSV row at a time instead of reading the entire 4GB file into memory?

Example code:

<?php
function getRows($file){
    $handle = fopen($file, 'rb');
    if($handle === false){
        throw new Exception();
    }
    while(feof($handle)===false){
        $line_of_txt=fgetcsv($handle);
    }
    fclose($handle);
    return $line_of_txt;
}
foreach(getRows('DWBankStatmentApril.csv') as $row){
    print_r($row);
}
?>

Got it right now.

 <?php
function getRows($file){
    $handle = fopen($file, 'rb');
    if($handle === false){
        throw new Exception();
    }
    while(feof($handle)===false){
        yield=fgetcsv($handle);
    }
    fclose($handle);

}
foreach(getRows('DWBankStatmentApril.csv') as $row){
    print_r($row);
}
?>

The issue was solved by using a generator instead, they are mainly used for forward-only interating large data sets with a tiny amount of system memory.