foreach ($table['exists'] as $item) {
            switch ($i) {
                case 0:
                    echo($item.' = "'.$_POST[$item].'" AND ');
                    break;

                case $len - 1:
                    echo($item.' = "'.$_POST[$item].'"');
                    break;

                default:
                    echo($item.' = "'.$_POST[$item].'" AND ');
                    break;
            }
            $i++;
        }

cep = "{CEP inserido}" AND rua = "Delfinópolis" AND dispo = "1"

$tabela = ['table'  => 'ceps',
                 'exists' => ['cep', 'rua', 'dispo'] ];

$existe = DBRead($table['table'], "WHERE {$minhaVarEntraAqui}");

$i=0;
        $len = count($table['exists']);
        foreach ($table['exists'] as $item) {
            switch ($i) {
                case 0:
                    $marray[0][$i] = $item.' = "'.$_POST[$item].'" AND ';
                    break;

                case $len - 1:
                    $marray[1][$i] = $item.' = "'.$_POST[$item].'"';
                    break;

                default:
                    $marray[2][$i] = $item.' = "'.$_POST[$item].'" AND ';
                    break;
            }
            for ($j = 0; $j < 3; $j++)
                echo $marray[$j][$i];
            $i++;
        }