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Explode STRING e SELECT em cada caracter (PHP)


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Explode STRING e SELECT em cada caracter (PHP)


Preciso de ajuda no seguinte (estou usando PHP e MYSQL)

Preciso separar uma STRING, consultar o Banco para cada caracter e fazer um select independente para cada um, recuperando os itens correspondentes a ele na tabela.

CÓDIGO(pode ter até 17caracteres), exemplo: A19 || TABELA >>
| A = 5 |
1 = 3 |
9 = 7 | 

VALOR A VOLTAR CONSULTA SERIA
537

Ainda preciso realizar operações em cada retorno
5X1 = 5 + 
3X2 = 6 +
7X3 = 21 >>>>
$TOTAL = 32

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