Enhance FILTER_VALIDATE_INT option in filter_var

[takeokunn]

Feature request

https://phpstan.org/r/cd41cbe6-b757-4d79-b345-cbc660f00d1e

assertType("1", intval("1"));
assertType("100", intval("100"));
assertType("0", filter_var("0", FILTER_VALIDATE_INT));
assertType("1", filter_var("1", FILTER_VALIDATE_INT));
assertType("100", filter_var("100", FILTER_VALIDATE_INT));
assertType("false", filter_var("abc", FILTER_VALIDATE_INT));
assertType("null", filter_var("abc", FILTER_VALIDATE_INT, FILTER_NULL_ON_FAILURE));

// for octal
assertType("8", filter_var("0o10", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_OCTAL));

// for hex
assertType("16", filter_var("0x10", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX));

intval can cast ConstantString like1 , but filter_var cannot.

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