php - Uncaught TypeError: array_key_exists() -

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i want modify array of samples&lables , pass predict() function. must because want samples , labels other.xls file , store in array can fit in code. original code:

    $samples = [[5, 1, 1], [1, 5, 1], [1, 1, 5]];// array() form?     $labels = ['a', 'b', 'c'];     $classifier = new naivebayes();     $classifier->train($samples, $labels);      $classifier->predict([3, 1, 1]) //return      //other file.php     predict(array $sample){     $predictions = [];     foreach ($this->targets $index => $label) {         $predictions[$label] = 0;         foreach ($sample $token => $count) {             if (array_key_exists($token, $this->samples[$index])) {                 $predictions[$label] += $count * $this->samples[$index][$token];             }         }       }

then modified code to:

    $samples = array("samples1","samples2", "samples3",...,"samplesn");     $labels = array("a","c","b");

but me error :

uncaught typeerror: array_key_exists() expects parameter 2 array, string given in

just curious kind of array [[...]] this? same normal array(..)? can me? i'm sure wrong remake array


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