vector a:
Array
(
    [0] => 2
    [1] => 3
    [2] => foo
    [3] => 5.5
    [4] => 43.3
    [5] => 21.11
)
----
vector b -> a notice (b = log(Π) * a)
BEMERKUNG Fehlernummer:[1024] Fehlermeldung: Value at position 2 is not a number, using 0 (zero)

Erbegnis vector b:
Array
(
    [0] => 2.2894597717
    [1] => 3.43418965755
    [2] => 0
    [3] => 6.29601437217
    [4] => 49.5668040573
    [5] => 24.1652478903
)
----
vector c - a warning
WARNUNG [512] Incorrect input vector, array of values expected

NULL
----
vector d - fatal error
FEHLER [256] log(x) for x <= 0 is undefined, you used: scale = -2.5

  Fataler Fehler in Zeile 46 in Datei /hp/bu/ab/ke/www/mehlwurm-rv.de/testError.php, PHP 5.3.29 (Linux)

Abbruch...