PHP

PHP Information

Show installed PHP version

php -v

List active compiled php modules

php -m

Show php configuration and environment information

php -i

Run Script

Manually execute a PHP script

php -q <script>

PHP Interactive Shell

Start interactive shell from the command line

php -a

Exit interactive shell

quit
CTRL+C

Simple PHP Server

Start a server in the current directory

php -S localhost:8000

Output Strings

Output a string or formatted string

echo $var
print($var)
printf($format, $value)

Output readable/detailed debugging information about a variable

print_r($var)
var_dump($var)

Output valid php code that describes the variable

var_export($var)

Introspection

Class Introspection

Get declared classes, traits and interfaces

get_declared_classes()
get_declared_traits()
get_declared_interfaces()

Get defined vars, constants and functions

get_defined_vars()
get_defined_constants()
get_defined_functions()

Check if a class exists

class_exists($class_name)

Get the parent classes, interfaces and traits a class uses

class_parents($class_name_or_instance)
class_implements($class_name_or_instance)
class_uses($class_name_or_instance)

Get parent class, methods or vars from a class

get_parent_class($class_name_or_instance)
get_class_methods($class_name_or_instance)
get_class_vars($class_name)

Object Introspection

Test for an object and get the class an object belongs to

is_object($object)
get_class($object)

Check if a method or property exists on an object

method_exists($object, $method_name)
property_exists($object, $property_name)

Get object vars and object parent class

get_object_vars($object)
get_parent_class($object)

Get the type of a variable

gettype($var)

Test if an object is a particular class

is_a($object, $class_name)
$object instanceof $class

Array Introspection

Output array keys

array_keys($array)

Typecast object to array and output list of keys

print_r(array_keys((array)$object))