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RFC: https://wiki.php.net/rfc/null_coalesce_equal_operator $a ??= $b is $a ?? ($a = $b), with the difference that $a is only evaluated once, to the degree that this is possible. In particular in $a[foo()] ?? $b function foo() is only ever called once. However, the variable access themselves will be reevaluated.
85 lines
1.3 KiB
PHP
85 lines
1.3 KiB
PHP
--TEST--
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Coalesce assign (??=): Exception handling
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--FILE--
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<?php
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$foo = "fo";
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$foo .= "o";
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$bar = "ba";
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$bar .= "r";
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function id($arg) {
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echo "id($arg)\n";
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return $arg;
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}
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function do_throw($msg) {
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throw new Exception($msg);
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}
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$ary = [];
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try {
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$ary[id($foo)] ??= do_throw("ex1");
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} catch (Exception $e) {
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echo $e->getMessage(), "\n";
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}
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var_dump($ary);
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class AA implements ArrayAccess {
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public function offsetExists($k) {
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return true;
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}
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public function &offsetGet($k) {
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$var = ["foo" => "bar"];
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return $var;
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}
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public function offsetSet($k,$v) {}
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public function offsetUnset($k) {}
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}
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class Dtor {
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public function __destruct() {
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throw new Exception("dtor");
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}
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}
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$ary = new AA;
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try {
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$ary[new Dtor][id($foo)] ??= $bar;
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} catch (Exception $e) {
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echo $e->getMessage(), "\n";
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}
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var_dump($foo);
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class AA2 implements ArrayAccess {
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public function offsetExists($k) {
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return false;
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}
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public function offsetGet($k) {
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return null;
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}
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public function offsetSet($k,$v) {}
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public function offsetUnset($k) {}
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}
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$ary = ["foo" => new AA2];
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try {
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$ary[id($foo)][new Dtor] ??= $bar;
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} catch (Exception $e) {
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echo $e->getMessage(), "\n";
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}
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var_dump($foo);
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?>
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--EXPECT--
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id(foo)
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ex1
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array(0) {
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}
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id(foo)
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dtor
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string(3) "foo"
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id(foo)
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dtor
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string(3) "foo"
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