Padosoft\Io\LogHelper::ftruncatestart()

Complexity

Conditions	6
Paths	5

Size

Total Lines	29
Code Lines	22

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
    public static function ftruncatestart(string $filename, $maxfilesize) : bool
    {
        if (!FileHelper::fileExistsSafe($filename)) {
            return false;
        }
        $size = filesize($filename);
        if ($size === false || ($size < $maxfilesize * 1.0)) {
            return false;
        }
        $maxfilesize = $maxfilesize * 0.5; //we don't want to do it too often...
        $fh = fopen($filename, "r+");
        if ($fh === false) {
            return false;
        }
        ftell($fh);
        fseek($fh, -$maxfilesize, SEEK_END);
        $drop = fgets($fh);
        $offset = ftell($fh);
        for ($x = 0; $x < $maxfilesize; $x++) {
            fseek($fh, $x + $offset);
            $c = fgetc($fh);
            fseek($fh, $x);
            fwrite($fh, $c);
        }
        ftruncate($fh, $maxfilesize - strlen($drop));
        fclose($fh);

        return true;
    }
}