CIII. Variable Functions

執行時期組態

php.ini中的設定會影響這些函數的行為。

表格 1. Variables Configuration Options

Name Default Changeable
unserialize_callback_func "" PHP_INI_ALL
For further details and definition of the PHP_INI_* constants see ini_set().

Here is a short explanation of the configuration directives.

unserialize_callback_func string

The unserialize callback function will called (with the undefind class' name as parameter), if the unserializer finds an undefined class which should be instanciated. A warning appears if the specified function is not defined, or if the function doesn't include/implement the missing class. So only set this entry, if you really want to implement such a callback-function.

See also unserialize().



內容目錄
doubleval -- Alias of floatval()
empty -- Determine whether a variable is set
floatval -- Get float value of a variable
get_defined_vars -- Returns an array of all defined variables
get_resource_type -- Returns the resource type
gettype -- Get the type of a variable
import_request_variables -- Import GET/POST/Cookie variables into the global scope
intval -- Get integer value of a variable
is_array -- Finds whether a variable is an array
is_bool -- Finds out whether a variable is a boolean
is_callable -- Find out whether the argument is a valid callable construct
is_double -- Alias of is_float()
is_float -- Finds whether a variable is a float
is_int -- Find whether a variable is an integer
is_integer -- Alias of is_int()
is_long -- Alias of is_int()
is_null -- Finds whether a variable is NULL
is_numeric -- Finds whether a variable is a number or a numeric string
is_object -- Finds whether a variable is an object
is_real -- Alias of is_float()
is_resource -- Finds whether a variable is a resource
is_scalar -- Finds whether a variable is a scalar
is_string -- Finds whether a variable is a string
isset -- Determine whether a variable is set
print_r -- Prints human-readable information about a variable
serialize -- Generates a storable representation of a value
settype -- Set the type of a variable
strval -- Get string value of a variable
unserialize -- Creates a PHP value from a stored representation
unset -- Unset a given variable
var_dump -- Dumps information about a variable
var_export -- Outputs or returns a string representation of a variable