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|
--TEST--
Coalesce assign (??=): Basic behavior
--FILE--
<?php
// Refcounted values
$foo = "fo";
$foo .= "o";
$bar = "ba";
$bar .= "r";
// Identity function used to track single-evaluation
function id($arg) {
echo "id($arg)\n";
return $arg;
}
echo "Simple variables:\n";
$a = 123;
$a ??= 456;
var_dump($a);
$b = null;
$b ??= $foo;
var_dump($b);
$c = $foo;
$c ??= $bar;
var_dump($c);
$d ??= $foo;
var_dump($c);
echo "\nArrays:\n";
$ary = [];
$ary["foo"] ??= 123;
$ary[$foo] ??= $bar;
$ary[$bar] ??= $foo;
var_dump($ary);
$ary = [];
$ary[id($foo)] ??= 123;
$ary[id($foo)] ??= $bar;
$ary[id($bar)] ??= $foo;
var_dump($ary);
echo "\nObjects:\n";
$obj = new stdClass;
$obj->foo ??= 123;
$obj->$foo ??= $bar;
$obj->$bar ??= $foo;
var_dump($obj);
$obj = new stdClass;
$obj->{id($foo)} ??= 123;
$obj->{id($foo)} ??= $bar;
$obj->{id($bar)} ??= $foo;
var_dump($obj);
class Test {
public static $foo;
public static $bar;
}
echo "\nStatic props:\n";
Test::$foo ??= 123;
Test::$$foo ??= $bar;
Test::$$bar ??= $foo;
var_dump(Test::$foo, Test::$bar);
Test::$foo = null;
Test::$bar = null;
Test::${id($foo)} ??= 123;
Test::${id($foo)} ??= $bar;
Test::${id($bar)} ??= $foo;
var_dump(Test::$foo, Test::$bar);
?>
--EXPECT--
Simple variables:
int(123)
string(3) "foo"
string(3) "foo"
string(3) "foo"
Arrays:
array(2) {
["foo"]=>
int(123)
["bar"]=>
string(3) "foo"
}
id(foo)
id(foo)
id(bar)
array(2) {
["foo"]=>
int(123)
["bar"]=>
string(3) "foo"
}
Objects:
object(stdClass)#1 (2) {
["foo"]=>
int(123)
["bar"]=>
string(3) "foo"
}
id(foo)
id(foo)
id(bar)
object(stdClass)#2 (2) {
["foo"]=>
int(123)
["bar"]=>
string(3) "foo"
}
Static props:
int(123)
string(3) "foo"
id(foo)
id(foo)
id(bar)
int(123)
string(3) "foo"
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