Deprecate ${} string interpolation

https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Author: iluuu1994

UPGRADING

@@ -106,6 +106,10 @@ PHP 8.2 UPGRADE NOTES
 
     RFC: https://wiki.php.net/rfc/deprecate_partially_supported_callables
 
+  . The "${var}" and "${expr}" style string interpolations are deprecated and
+    will be removed in PHP 9. Use "$var"/"{$var}" or "${expr}", respectively.
+    RFC: https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation
+
 - Mbstring:
   . Use of QPrint, Base64, Uuencode, and HTML-ENTITIES 'text encodings' is
     deprecated for all Mbstring functions. Unlike all the other text

Zend/tests/bug61681.phpt

@@ -7,5 +7,6 @@ $la = "ooxx";
 echo "${substr('laruence', 0, 2)}";
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 ooxx

Zend/tests/deprecate_dollar_brace_string_interpolation_1.phpt

@@ -0,0 +1,12 @@
+--TEST--
+"${}" emits a deprecation
+--FILE--
+<?php
+
+$foo = 'bar';
+var_dump("${foo}");
+
+?>
+--EXPECTF--
+Deprecated: Using ${var} in strings is deprecated, use {$var} instead in %s on line %d
+string(3) "bar"

Zend/tests/exception_in_nested_rope.phpt

@@ -13,5 +13,6 @@ try {
 }
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 Exception

Zend/tests/flexible-heredoc-complex-test1.phpt

@@ -21,7 +21,10 @@ var_dump(<<<DOC1
     DOC1);
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
+
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 string(5) "a
 b
 c"

Zend/tests/flexible-heredoc-complex-test2.phpt

@@ -21,7 +21,10 @@ var_dump(<<<DOC1
     DOC1);
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
+
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 string(5) "a
 b
 c"

Zend/tests/flexible-heredoc-complex-test3.phpt

@@ -21,7 +21,10 @@ var_dump(<<<DOC1
     DOC1);
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
+
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 string(8) "  a
  b
 c"

Zend/tests/flexible-heredoc-complex-test4.phpt

@@ -28,7 +28,10 @@ the same delimiter name as the heredoc
 }
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
+
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 string(8) "Test
 FOO"
 string(16) "    Test

Zend/tests/temporary_cleaning_016.phpt

@@ -11,5 +11,6 @@ try {
 }
 ?>
 DONE
---EXPECT--
+--EXPECTF--
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
 DONE

Zend/tests/warning_during_heredoc_scan_ahead.phpt

@@ -14,4 +14,6 @@ Warning: Octal escape sequence overflow \400 is greater than \377 in %s on line
 
 Warning: Octal escape sequence overflow \400 is greater than \377 in %s on line %d
 
+Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in %s on line %d
+
 Warning: Undefined variable $ in %s on line %d