On this page, functions are enlisted to handle the variables in PHP. No installation is required as they are part of the core language.
| Function | Description |
|---|---|
| boolval() | Returns the boolean value of a variable |
| debug_zval_dump() | Dump string representation of an internal zend value to output |
| doubleval() | Alias of floatval() |
| empty() | Check if 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 if variable is a boolean |
| is_callable() | Check if the contents of a variable can be called a function |
| is_countable() | Checks if contents of a variable is a countable value |
| is_double() | Alias of is_float() |
| is_float() | Checks if variable is of type float |
| is_int() | Checks if variable is of type integer |
| is_integer() | Alias of is_int() |
| is_iterable() | Check if contents of a variable is an iterable value |
| is_long() | Alias of is_int() |
| is_null() | Checks if variable is NULL |
| is_numeric() | Check if variable is a number or a numeric string |
| is_object() | Checks if variable is an object |
| is_real() | Alias of is_float() |
| is_resource() | Checks if variable is a resource |
| is_scalar() | Checks if variable is a scalar |
| is_string() | Check if variable is of type string |
| isset() | Checks if variable is set (declared and not NULL) |
| print_r() | Print the information about a variable in a human-readable way |
| serialize() | Convert storable representation of a value |
| settype() | Convert variable to a specific type |
| strval() | Returns the string value of a variable |
| unserialize() | Convert serialized data back into actual data |
| unset() | Unset a variable |
| var_dump() | Dump information about one or more variables |
| var_export() | Returns structured information (valid PHP code) about a variable |
