arrays - PHP Invalid argument supplied for foreach() -

i have array:

    $y_exceptions = array(     "lay",     "interlay",     "display",     "delay",     "obey",     "decay",     "play",     "slay" ); 

i'm checking if word in array this:

foreach($y_exceptions $thisexception) { 

which throws error

invalid argument supplied foreach()

what have done wrong?

$y_exceptions needs array processed foreach loop. possible $y_exceptions set null before foreach loop. null not treated array, foreach expects—hence warning.

on solution stricter validation before foreach:

if (!is_array($y_exceptions)) {     // throw exception } 

alternatively, instruct foreach loop run $y_exceptions array, though may cause errors downstream:

foreach ((array) $y_exceptions $thisexception) {     // stuff }