why-when-generator-php-blog-gist6.php

<?php
function getLines($file): array {
    $f = fopen($file, 'r');
    if (!$f) throw new Exception();
    $lines = [];
    while ($line = fgets($f)) {
        $lines[] = $line;
    }
    return $lines;
}

$filePath = $argv[1];

$lines = getLines($filePath);
foreach ($lines as $line) {
    echo $line. "\n";
}