[PHP-NOTES] note 130256 added to language.operators.precedence

$a = 1;

    echo $a + $a                 .'<br>'; // 2
    echo $a + $a++             .'<br>'; // 3 
    echo $a + $a++             .'<br>'; // 5
    echo +$a + $a++           .'<br>'; // 6
    echo +$a+ + $a++         .'<br>'; // 8
    echo +$a++ + $a++       .'<br>'; // 11
    echo +$a++ + +$a++     .'<br>'; // 15
    echo +$a++ + +$a++     .'<br>'; // 19
    echo +$a++ + +$a++     .'<br>'; // 23 ?
    echo +$a++ + +$a++     .'<br>'; // 27 ?
    echo +$a++ + +$a++     .'<br>'; // 31 ?

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Manual Page -- https://php.net/manual/en/language.operators.precedence.php
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