How can one efficiently read a file line by line in PHP?

Reading a file line by line in PHP can be efficiently done using the `fgets()` function within a while loop. This allows you to read each line of the file sequentially without loading the entire file into memory at once. 

$filename = "example.txt";
$handle = fopen($filename, "r");

if ($handle) {
    while (($line = fgets($handle)) !== false) {
        echo $line;
    }
    
    fclose($handle);
} else {
    echo "Error opening the file.";
}

Keywords

file handling fopen fgets feof fclose

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