通过这些校验函数可以很容易的验证数据是否是执行的类型
is_array() – Test for Arrays is_bool() – Test for Booleans (TRUE, FALSE) is_float() – Test for Floating-point numbers is_int() – Test for Integers is_null() – Test for NULLs is_numeric() – Test forNumeric values, even as a string (e.g., ‘ 20′ ) is_resource() – Test for Resources, like a database connection is_scalar() – Test for Scalar (single-valued) variables is_string() – Test for Strings
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