large-file-copy.php

<?php

define('READ_SIZE', 2 ** 24);
if (isset($argv[1], $argv[2])) {
    $from = $argv[1];
    $to = $argv[2];

    if (!is_file($from)) {
        printf("This is directory or not found file.\n");
        return;
    }

    if (is_dir($to)) {
        $to .= '/' . basename($from);
    }

    if (is_file($to)) {
        do {
            printf("Overwrite file ? (y/n): ");
            $answer = fread(STDIN, 1);
            if ($answer === 'n') {
                printf("Bye.\n");
                return;
            } else if ($answer !== 'y') {
                printf("Missing answer. ");
            }
        } while ($answer !== 'y');
    }

    // start copy
    $handle = fopen($from, 'r');
    $newHandle = fopen($to, 'wb');
    $size = filesize($from);
    $read = 0;
    $beforeStrings = '';

    printf("Start Copy\n");
    while (!feof($handle) && $read < $size) {

        $buffer = fread($handle, READ_SIZE);
        fwrite($newHandle, $buffer);
        $read += READ_SIZE;
        $result = floor(($read / $size) * 100);
        for ($i = 0; $i < strlen($beforeStrings); $i++) echo chr(0x08);
        $strings = sprintf("copied (%d%%/100%%)", $result);
        if ($beforeStrings !== $strings) {
            print($strings);
        }
        $beforeStrings = $strings;
    }
    printf("\n");

} else {
    printf("no parameters.\n");
}