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Create a php file of specified size

How to create a file of a given size (regardless of content) in PHP?

I have to create a file larger than 1GB. Maximum approximately 4-10GB

P粉221046425P粉221046425382 days ago582

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  • P粉561323975

    P粉5613239752023-10-27 11:36:14

    If the contents of the file are not relevant, just populate it - but make sure you don't generate variables that are too large to hold in memory:

    <?php
    $fh = fopen("somefile", 'w');
    $size = 1024 * 1024 * 10; // 10mb
    $chunk = 1024;
    while ($size > 0) {
       fputs($fh, str_pad('', min($chunk,$size)));
       $size -= $chunk;
    }
    fclose($fh);

    If the file must be read by something else - then how you do it depends on what else needs to read it.

    C.

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  • P粉039633152

    P粉0396331522023-10-27 09:16:19

    You can use fopen and fseek

    define('SIZE',100); // size of the file to be created.
    $fp = fopen('somefile.txt', 'w'); // open in write mode.
    fseek($fp, SIZE-1,SEEK_CUR); // seek to SIZE-1
    fwrite($fp,'a'); // write a dummy char at SIZE position
    fclose($fp); // close the file.

    When executing:

    $ php a.php
    
    $ wc somefile.txt
      0   1 100 somefile.txt
    $

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