Synchronized block in php 7

Question

i come from a java background where there were synchronized blocks:

The \"Synchronized\" keywords prevents concurrent access to a block of code or o

Answer 1

Other people answer with lots of words, but no code. Why don't you try this?

function synchronized($handler)
{
    $name = md5(json_encode(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS,1)[0]));
    $filename = sys_get_temp_dir().'/'.$name.'.lock';
    $file = fopen($filename, 'w');
    if ($file === false) {
        return false;
    }
    $lock = flock($file, LOCK_EX);
    if (!$lock) {
        fclose($file);
        return false;
    }
    $result = $handler();
    flock($file, LOCK_UN);
    fclose($file);
    return $result;
}

function file_put_contents_atomic($filename, $string)
{
    return synchronized(function() use ($filename,$string) {
        $tempfile = $filename . '.temp';
        $result = file_put_contents($tempfile, $string);
        $result = $result && rename($tempfile, $filename);
        return $result;
    });
}

The above code does an atomic file_put_contents using a custom "synchronized" function.

Source: https://tqdev.com/2018-java-synchronized-block-in-php