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see string conversion
Смотрите Конвертация строк в числа

when casting or forcing a conversion from array to string, the result will be the word array.
$foo = 10; / / $foo is an integer $str = "$foo"; / / $str is a string $fst = (string) $foo; / / $fst is also a string / / this prints out that "they are the same "if ($fst === $str) {echo "they are the same";}

to work around this, you have to use a set of api functions to force a type conversion on every argument that' s being passed (see tablo 32-1).
to work around this, you have to use a set of api functions to force a type conversion on every argument that' s being passed (see Табл. 32-1