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Remove duplicates form CSV - PHP Coding Help

<?php
$filename 
"file.csv"; $file fopen($filename"r"); $read fread($filefilesize($filename));
$split array_unique(explode("\n"$read));
fclose($file);
$filename2 "other.csv";
$file2 fopen($filename2"a");

foreach(
$split as $key=>$value) {
    if(
$value != "") {
        
fwrite($file2$value "\n");
    }
}
fclose($file2);

echo 
"Update done successfully."; ?> 

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