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Available PHP Functions

PHP offers many available standard functions. The table below lists several commonly used ones:

Function Description
boolval Get the boolean value of a variable
debug_zval_dump View a variable's reference count and type information in the Zend engine
doubleval Alias of floatval
empty Check whether a variable is empty
floatval Get the float value of a variable
get_defined_vars Return an array of all defined variables
get_resource_type Return the type of a resource
gettype Get the type of a variable
import_request_variables Import GET/POST/Cookie variables into the global scope
intval Get the integer value of a variable
is_array Check if a variable is an array
is_bool Check if a variable is of type boolean
is_callable Verify that the contents of a variable can be called as a function
is_double Alias of is_float
is_float Check if a variable is of type float
is_int Check if a variable is an integer
is_integer Alias of is_int
is_iterable Check if the contents of a variable is an iterable value
is_long Alias of is_int
is_null Check if a variable is NULL
is_numeric Check if a variable is a number or a numeric string
is_object Check if a variable is an object
is_real Alias of is_float
is_resource Check if a variable is a resource
is_scalar Check if a variable is a scalar
is_string Check if a variable is a string
isset Check if a variable is set and is not NULL
print_r Print variables in a readable format
serialize Serialize an object
settype Set the type of a variable
strval Get the string value of a variable
unserialize Create a PHP value from a stored representation
unset Release the given variable
var_dump Print information about a variable
var_export Output or return a variable as a string representation

Password Hashing Algorithms

Function Description
password_get_info Return information about the specified hash
password_hash Create a hash of a password
password_needs_rehash Check if a hash matches the specified options
password_verify Verify that a password matches a hash
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