Quickly generate large text file with random string content.

generate_large_file.php

#!/usr/bin/env php

<?php

## http://stackoverflow.com/questions/4356289/php-random-string-generator
function generateRandomString($length = 10)
{
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

/**
* Create text file 
* 
* @param string $filename  output file name
* @param int $size ouput file size
* @param boolean $force
*/
function createLargeTextFile($filename, $size, $force = false)
{
    if (file_exists($filename) && $force == false)
    {
        die("Output file '$filename' is exist!.\n\n");
    }

    $fp = fopen($filename, 'w');

    for ($i = 0; $i < $size;  $i++)
    {
        fwrite($fp, generateRandomString(1024));
        fwrite($fp, "\n");
    }
    fclose($fp);

}

// 
$shortopts  = "";
$shortopts .= "f:";  // output file name.
$shortopts .= "o";  // if output file exist it will be overwritten.
$shortopts .= "s:";  // output file size(kilo byte). default 10

$options = getopt($shortopts);

$file = array_key_exists('f', $options) ? $options['f'] : 'data.txt';
$size = array_key_exists('s', $options) ? intval($options['s']) : 10;
$force = array_key_exists('o', $options) ? true : false;

#var_dump($options);
createLargeTextFile($file, $size, $force);

?>