(unset) casts are no longer supported since PHP 8

Author: nikic

spec/10-expressions.md

@@ -1888,6 +1888,10 @@ cast-type: one of
    real   string   unset
 </pre>
 
+**Constaints**
+
+A *cast-type* of `unset` is no longer supported and results in a compile-time error.
+
 **Semantics**
 
 With the exception of the *cast-type* unset and binary (see below), the
@@ -1914,9 +1918,6 @@ A *cast-type* of `object` results in a [conversion to type `object`](08-conversi
 
 A *cast-type* of `string` results in a [conversion to type `string`](08-conversions.md#converting-to-string-type).
 
-A *cast-type* of `unset` always results in a value of `NULL`. (This use of
-`unset` should not be confused with the [`unset` statement](11-statements.md#the-unset-statement).
-
 **Examples**
 
 ```PHP

tests/expressions/unary_operators/cast.phpt

@@ -29,8 +29,10 @@ echo var_dump((binary)"");
 echo var_dump((binary)"abcdef");
 
 echo var_dump($v);
-echo var_dump((unset)$v);
-echo var_dump($v);
+
+// The (unset) cast is no longer supported
+//echo var_dump((unset)$v);
+//echo var_dump($v);
 //*/
 
 ///*
@@ -146,7 +148,6 @@ var_dump($binStr);
 $binStr = b"AaBb123$%^";
 var_dump($binStr);
 --EXPECTF--
-Deprecated: The (unset) cast is deprecated in %s on line %d
 bool(false)
 bool(false)
 int(0)
@@ -167,8 +168,6 @@ string(1) "0"
 string(0) ""
 string(6) "abcdef"
 int(0)
-NULL
-int(0)
 int(10)
    bool(true)
    bool(true)
@@ -456,7 +455,7 @@ array(2) {
    int(1)
    float(1)
 
-Notice: Array to string conversion in %s/expressions/unary_operators/cast.php on line 50
+Notice: Array to string conversion in %s/expressions/unary_operators/cast.php on line %d
 string(5) "Array"
    array(2) {
   [5]=>
@@ -485,7 +484,7 @@ array(4) {
    int(1)
    float(1)
 
-Notice: Array to string conversion in %s/expressions/unary_operators/cast.php on line 50
+Notice: Array to string conversion in %s/expressions/unary_operators/cast.php on line %d
 string(5) "Array"
    array(4) {
   [0]=>
@@ -555,7 +554,7 @@ object(E)#3 (3) {
 $key: >Epriv_prop<, len: 12, $val: ><
 $key: >*prot_prop<, len: 12, $val: >12.345<
 
-Notice: Array to string conversion in %s/expressions/unary_operators/cast.php on line 115
+Notice: Array to string conversion in %s/expressions/unary_operators/cast.php on line %d
 $key: >publ_prop<, len: 9, $val: >Array<
 ---------------
 resource(1) of type (stream)