Php return null or string
Nullable types Type declarations for parameters and return values can now be marked as nullable by prefixing the type name with a question mark. This signifies that as well as the specified type, Show
testReturn(): ?string The above example will output: string(10) "elePHPant" NULL string(10) "elePHPant" NULL Uncaught Error: Too few arguments to function test(), 0 passed in... Void functions A void return type has been introduced. Functions declared with void as their return type must either omit their return statement altogether, or use an empty return statement.
The above example will output: Attempting to use a void function's return value
simply evaluates to Symmetric array destructuring The shorthand array syntax (
Class constant visibilitySupport for specifying the visibility of class constants has been added.
iterable pseudo-typeA new pseudo-type (similar to callable) called iterable has been introduced. It may be used in parameter and return types, where it accepts either arrays or objects that implement the Traversable interface. With respect to subtyping, parameter types of child classes may broaden a parent's declaration of array or Traversable to iterable. With return types, child classes may narrow a parent's return type of iterable to array or an object that implements Traversable.
Multi catch exception handling Multiple exceptions per catch block may
now be specified using the pipe character (
Support for keys in list() You can now specify keys in
list(), or its new shorthand
Support for negative string offsets Support for negative string offsets has been added to the
string manipulation functions accepting offsets, as well as to string indexing with
The above example will output: Negative string and array offsets are now also supported in the simple variable parsing syntax inside of strings.
The above example will output: The last character of 'bar' is 'r'. Support for AEAD in ext/opensslSupport for AEAD (modes GCM and CCM) have been added by extending the openssl_encrypt() and openssl_decrypt() functions with additional parameters. Convert callables to Closures with Closure::fromCallable()A new static method has been introduced to the Closure class to allow for callables to be easily converted into Closure objects.
privateFunction($param) The above example will output: Asynchronous signal handlingA new function called pcntl_async_signals() has been introduced to enable asynchronous signal handling without using ticks (which introduce a lot of overhead).
The above example will output: HTTP/2 server push support in ext/curl Support for server push has been added to the CURL extension (requires version 7.46 and above). This can be leveraged through the curl_multi_setopt() function with the new Stream Context OptionsThe tcp_nodelay stream context option has been added. DYM ¶ 4 years ago
unti1x ¶ 4 years ago
What is return void in PHP?Void functions ¶
A void return type has been introduced. Functions declared with void as their return type must either omit their return statement altogether, or use an empty return statement. null is not a valid return value for a void function. function swap(&$left, &$right): void.
What is return type in PHP?Definition and Usage. The return keyword ends a function and, optionally, uses the result of an expression as the return value of the function. If return is used outside of a function, it stops PHP code in the file from running.
How can I return two variables in PHP?PHP doesn't support to return multiple values in a function. Inside a function when the first return statement is executed, it will direct control back to the calling function and second return statement will never get executed.
What is the use of return in PHP?The purpose of return statement in PHP is to return control of program execution back to the environment from which it was called. Upon returning, execution of expression following the one which invooked other function or module.
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