Functions available in PHP

PHP available functions

PHP provides many available standard functions. The following table lists some commonly used ones:

Get the type of variableImport GET/POST/Cookie variables into the global scopeDetect whether the variable is an arrayDetect whether the variable is BooleanCheck whether the parameter is a legal callable structureis_float’s aliasDetect whether the variable is a floating point typeCheck whether the variable is an integeralias of is_intDetect whether the content of the variable is an iterable valuealias of is_intDetect whether the variable is NULLDetect whether the variable is a number or a numeric stringPrint the relevant information of the variableOutput or return a variable, expressed in string form

Function	Description
boolval	Get the Boolean value of the variable
debug_zval_dump	View the reference count and type information of a variable in the zend engine
doubleval	Alias ​​for floatval
empty	Check a variable Whether it is empty
floatval	Get the floating point value of the variable
get_defined_vars	Returns an array composed of all defined variables
get_resource_type	Return resource type
##gettype
import_request_variables
intval	Get the integer value of the variable
##is_array
is_bool
is_callable
is_double
is_float
is_int
is_integer
is_iterable
is_long
is_null
is_numeric
is_object	Detect whether the variable is an object
is_real	is_float’s alias
is_resource	Detect whether the variable is a resource type
is_scalar	Detect whether the variable is a scalar
is_string	Detect whether the variable is a string
isset	Detect whether the variable has been set and is not NULL
print_r	Print variables and output easy-to-read information.
serialize	Serialize object
settype	Set the type of variable
strval	Get the string value of the variable
unserialize	Create a PHP value from a stored representation
unset	Release the given variable
##var_dump
var_export

Password hashing algorithm

Function Descriptionpassword_get_info password_hash password_needs_rehash password_verify

	Returns information related to the specified hash (hash)
	Create a password Hash
	Check whether the hash value matches the specified option
	Verify whether the password matches the hash value