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@ 2015-10-08T10:53:21Z

<?php
$latest_filename = "1444301049_10.PNG";
if((int) substr($latest_filename, -6, -4) >= 10)
    {
        $file = (int) substr($latest_filename, -6) + 1;
   var_dump($file);
        $string = $path . $name . "_" . (string)$file . ".PNG";
//    var_dump($string);
    }

Output
Performance
VLD
References
Branches

substr: documentation ( source)
var_dump: documentation ( source)

preferences:dark modelive preview

53.11 ms | 402 KiB | 5 Q