Các chức năng xử lý biến trong PHP
Các chức năng xử lý biến trong PHP
Các hàm xử lý biến PHP là một phần của lõi PHP. Không cần cài đặt để sử dụng các chức năng này.
| Function | Description |
|---|---|
| boolval() | Returns the boolean value of a variable |
| debug_zval_dump() | Dumps a string representation of an internal zend value to output |
| doubleval() | Alias of floatval() |
| empty() | Checks whether a variable is empty |
| floatval() | Returns the float value of a variable |
| get_defined_vars() | Returns all defined variables, as an array |
| get_resource_type() | Returns the type of a resource |
| gettype() | Returns the type of a variable |
| intval() | Returns the integer value of a variable |
| is_array() | Checks whether a variable is an array |
| is_bool() | Checks whether a variable is a boolean |
| is_callable() | Checks whether the contents of a variable can be called as a function |
| is_countable() | Checks whether the contents of a variable is a countable value |
| is_double() | Alias of is_float() |
| is_float() | Checks whether a variable is of type float |
| is_int() | Checks whether a variable is of type integer |
| is_integer() | Alias of is_int() |
| is_iterable() | Checks whether the contents of a variable is an iterable value |
| is_long() | Alias of is_int() |
| is_null() | Checks whether a variable is NULL |
| is_numeric() | Checks whether a variable is a number or a numeric string |
| is_object() | Checks whether a variable is an object |
| is_real() | Alias of is_float() |
| is_resource() | Checks whether a variable is a resource |
| is_scalar() | Checks whether a variable is a scalar |
| is_string() | Checks whether a variable is of type string |
| isset() | Checks whether a variable is set (declared and not NULL) |
| print_r() | Prints the information about a variable in a human-readable way |
| serialize() | Converts a storable representation of a value |
| settype() | Converts a variable to a specific type |
| strval() | Returns the string value of a variable |
| unserialize() | Converts serialized data back into actual data |
| unset() | Unsets a variable |
| var_dump() | Dumps information about one or more variables |
| var_export() | Returns structured information (valid PHP code) about a variable |