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Segurança

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Guest Guest

Estou com uma duvida quanto a segurança do meu site.Consegui trocar as aspas simples de uma variavel usando o "replace", mas agora fiquei com duas duvidas.

1 - Como trocar as aspas duplas de duas variaveis?

2 - Como validar se uma variavel contem apenas numeros?

Agradecimentos.

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