Online PHP editor | rfc for tI0WW

@ 2013-10-25T12:38:58Z

<?php

function distance($vect1, $vect2) 
{
    if (!is_array($vect1) || !is_array($vect2)) {

        return NULL;
    }

    if (count($vect1) != count($vect2)) {

        return NULL;
    }

    for ($i=0; $i<count($vect1); $i++) {
        $c1 = $vect1[$i]; $c2 = $vect2[$i];
        $d = 0.0;
        if (!is_numeric($c1)) {
            trigger_error("Coordinate $i in vector 1 is not a number, using zero", 
                            E_USER_WARNING);
            $c1 = 0.0;
        }
        if (!is_numeric($c2)) {
            trigger_error("Coordinate $i in vector 2 is not a number, using zero", 
                            E_USER_WARNING);
            $c2 = 0.0;
        }
        $d += $c2*$c2 - $c1*$c1;
        return $d;
        echo sqrt($d);
    }
   
}



// variabile non definita, genera un warning



// definisce dei vettori

$b = array(5.5, 4.3);
$c = array(1, 3);

// genera un errore utente
distance($c, $b) ;

// un'altro errore utente
distance($b, "i am not an array") ;

// genera un warning
 distance($a, $b) ;

?>

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined variable $a in /in/tI0WW on line 53

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