Implement match expression

RFC: https://wiki.php.net/rfc/match_expression_v2

Closes GH-5371.

Author: iluuu1994

UPGRADING

@@ -571,6 +571,8 @@ PHP 8.0 UPGRADE NOTES
   . Added support for constructor property promotion (declaring properties in
     the constructor signature).
     RFC: https://wiki.php.net/rfc/constructor_promotion
+  . Added support for `match` expression.
+    RFC: https://wiki.php.net/rfc/match_expression_v2
 
 - Date:
   . Added DateTime::createFromInterface() and

Zend/tests/match/001.phpt

@@ -0,0 +1,36 @@
+--TEST--
+Basic match expression functionality test
+--FILE--
+<?php
+
+function wordify($x) {
+    return match ($x) {
+        0 => 'Zero',
+        1 => 'One',
+        2 => 'Two',
+        3 => 'Three',
+        4 => 'Four',
+        5 => 'Five',
+        6 => 'Six',
+        7 => 'Seven',
+        8 => 'Eight',
+        9 => 'Nine',
+    };
+}
+
+for ($i = 0; $i <= 9; $i++) {
+    print wordify($i) . "\n";
+}
+
+?>
+--EXPECT--
+Zero
+One
+Two
+Three
+Four
+Five
+Six
+Seven
+Eight
+Nine

Zend/tests/match/002.phpt

@@ -0,0 +1,19 @@
+--TEST--
+Match expression omit trailing comma
+--FILE--
+<?php
+
+function print_bool($bool) {
+    echo match ($bool) {
+        true => "true\n",
+        false => "false\n"
+    };
+}
+
+print_bool(true);
+print_bool(false);
+
+?>
+--EXPECT--
+true
+false

Zend/tests/match/003.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Match expression default case
+--FILE--
+<?php
+
+function get_value($i) {
+    return match ($i) {
+        1 => 1,
+        2 => 2,
+        default => 'default',
+    };
+}
+
+echo get_value(0) . "\n";
+echo get_value(1) . "\n";
+echo get_value(2) . "\n";
+echo get_value(3) . "\n";
+
+?>
+--EXPECT--
+default
+1
+2
+default

Zend/tests/match/004.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Match expression with true as expression
+--FILE--
+<?php
+
+function get_range($i) {
+    return match (true) {
+        $i >= 50 => '50+',
+        $i >= 40 => '40-50',
+        $i >= 30 => '30-40',
+        $i >= 20 => '20-30',
+        $i >= 10 => '10-20',
+        default => '0-10',
+    };
+}
+
+echo get_range(22) . "\n";
+echo get_range(0) . "\n";
+echo get_range(59) . "\n";
+echo get_range(13) . "\n";
+echo get_range(39) . "\n";
+echo get_range(40) . "\n";
+
+?>
+--EXPECT--
+20-30
+0-10
+50+
+10-20
+30-40
+40-50

Zend/tests/match/005.phpt

@@ -0,0 +1,12 @@
+--TEST--
+Match expression discarding result
+--FILE--
+<?php
+
+match (1) {
+    1 => print "Executed\n",
+};
+
+?>
+--EXPECT--
+Executed

Zend/tests/match/006.phpt

@@ -0,0 +1,13 @@
+--TEST--
+Match expression with no cases
+--FILE--
+<?php
+
+$x = match (true) {};
+
+?>
+--EXPECTF--
+Fatal error: Uncaught UnhandledMatchError: Unhandled match value of type bool in %s
+Stack trace:
+#0 {main}
+  thrown in %s on line %d

Zend/tests/match/007.phpt

@@ -0,0 +1,26 @@
+--TEST--
+Match expression exception on unhandled case
+--FILE--
+<?php
+
+function get_value($i) {
+    return match ($i) {
+        1 => 1,
+        2 => 2,
+    };
+}
+
+echo get_value(1) . "\n";
+echo get_value(2) . "\n";
+echo get_value(3) . "\n";
+
+?>
+--EXPECTF--
+1
+2
+
+Fatal error: Uncaught UnhandledMatchError: Unhandled match value of type int in %s
+Stack trace:
+#0 %s: get_value(3)
+#1 {main}
+  thrown in %s on line %d

Zend/tests/match/008.phpt

@@ -0,0 +1,25 @@
+--TEST--
+Match expression multiple conditions per case
+--FILE--
+<?php
+
+function is_working_day($day) {
+    return match ($day) {
+        1, 7 => false,
+        2, 3, 4, 5, 6 => true,
+    };
+}
+
+for ($i = 1; $i <= 7; $i++) {
+    var_dump(is_working_day($i));
+}
+
+?>
+--EXPECT--
+bool(false)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(false)

Zend/tests/match/009.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Pretty printing for match expression
+--FILE--
+<?php
+
+assert((function () {
+    match ('foo') {
+        'foo', 'bar' => false,
+        'baz' => 'a',
+        default => 'b',
+    };
+})());
+
+?>
+--EXPECTF--
+Warning: assert(): assert(function () {
+    match ('foo') {
+        'foo', 'bar' => false,
+        'baz' => 'a',
+        default => 'b',
+    };
+}()) failed in %s on line %d