exception.php

<?php

function get_zero()
{
    $res = rand(0, 9);
    if($res != 0) throw new \Exception('not a zero');
    return 'got a zero';
}

start:

try {
    echo get_zero(), PHP_EOL;
} catch(\Exception $e)
{
    echo $e->getMessage(), PHP_EOL;
    goto start;
}
echo 'php will start over and over until exception not thrown', PHP_EOL;