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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.
15 lines
214 B
PHP
15 lines
214 B
PHP
--TEST--
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Coalesce assign (??=): Cannot reassign $this
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--FILE--
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<?php
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class Test {
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public function foobar() {
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$this ??= 123;
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}
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}
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?>
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--EXPECTF--
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Fatal error: Cannot re-assign $this in %s on line %d
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