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@ 2017-07-06T17:26:01Z

<?php

unset($_GET["action"]);

echo "value:   "; var_dump($_GET["action"] ?? NULL);
echo "test:    "; var_dump(($_GET["action"] ?? NULL) === "submit");
echo "branch:  ";
if (($_GET["action"] ?? NULL) === "submit") {
    echo "submit";
} else {
    echo "not submit";
}
echo PHP_EOL;

echo PHP_EOL;

$_GET["action"] = "submit";

echo "value:   "; var_dump($_GET["action"] ?? NULL);
echo "test:    "; var_dump(($_GET["action"] ?? NULL) === "submit");
echo "branch:  ";
if (($_GET["action"] ?? NULL) === "submit") {
    echo "submit";
} else {
    echo "not submit";
}
echo PHP_EOL;

echo PHP_EOL;

$_GET["action"] = "preview";

echo "value:   "; var_dump($_GET["action"] ?? NULL);
echo "test:    "; var_dump(($_GET["action"] ?? NULL) === "submit");
echo "branch:  ";
if (($_GET["action"] ?? NULL) === "submit") {
    echo "submit";
} else {
    echo "not submit";
}
echo PHP_EOL;

Output for git.master, git.master_jit, rfc.property-hooks: value: NULL test: bool(false) branch: not submit value: string(6) "submit" test: bool(true) branch: submit value: string(7) "preview" test: bool(false) branch: not submit

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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