Replaced func_get_args() with variadic arguments

UPGRADE.md

@@ -1,5 +1,11 @@
 # Upgrade to 3.0
 
+## BC BREAK: Changes in the QueryBuilder API.
+
+1. The `select()`, `addSelect()`, `groupBy()` and `addGroupBy()` methods no longer accept an array of arguments. Pass each expression as an individual argument or expand an array of expressions using the `...` operator.
+2. The `select()`, `addSelect()`, `groupBy()` and `addGroupBy()` methods no longer ignore the first argument if it's empty.
+3. The `addSelect()` method can be no longer called without arguments.
+
 ## BC BREAK: `QueryBuilder::insert()`, `update()` and `delete()` signatures changed
 
 These methods now require the `$table` parameter, and do not support aliases anymore.

lib/Doctrine/DBAL/Query/Expression/ExpressionBuilder.php

@@ -5,9 +5,6 @@
 namespace Doctrine\DBAL\Query\Expression;
 
 use Doctrine\DBAL\Connection;
-use function func_get_arg;
-use function func_get_args;
-use function func_num_args;
 use function implode;
 use function sprintf;
 
@@ -41,37 +38,35 @@ public function __construct(Connection $connection)
     }
 
     /**
-     * Creates a conjunction of the given boolean expressions.
+     * Creates a conjunction of the given expressions.
      *
      * Example:
      *
      *     [php]
      *     // (u.type = ?) AND (u.role = ?)
      *     $expr->andX('u.type = ?', 'u.role = ?'));
      *
-     * @param mixed $x Optional clause. Defaults = null, but requires
-     *                 at least one defined when converting to string.
+     * @param string|CompositeExpression ...$expressions Requires at least one defined when converting to string.
      */
-    public function andX($x = null) : CompositeExpression
+    public function andX(...$expressions) : CompositeExpression
     {
-        return new CompositeExpression(CompositeExpression::TYPE_AND, func_get_args());
+        return new CompositeExpression(CompositeExpression::TYPE_AND, $expressions);
     }
 
     /**
-     * Creates a disjunction of the given boolean expressions.
+     * Creates a disjunction of the given expressions.
      *
      * Example:
      *
      *     [php]
      *     // (u.type = ?) OR (u.role = ?)
      *     $qb->where($qb->expr()->orX('u.type = ?', 'u.role = ?'));
      *
-     * @param mixed $x Optional clause. Defaults = null, but requires
-     *                 at least one defined when converting to string.
+     * @param string|CompositeExpression ...$expressions Requires at least one defined when converting to string.
      */
-    public function orX($x = null) : CompositeExpression
+    public function orX(...$expressions) : CompositeExpression
     {
-        return new CompositeExpression(CompositeExpression::TYPE_OR, func_get_args());
+        return new CompositeExpression(CompositeExpression::TYPE_OR, $expressions);
     }
 
     /**
@@ -210,27 +205,27 @@ public function isNotNull(string $x) : string
     }
 
     /**
-     * Creates a LIKE() comparison expression with the given arguments.
+     * Creates a LIKE comparison expression.
      *
      * @param string $x Field in string format to be inspected by LIKE() comparison.
      * @param mixed  $y Argument to be used in LIKE() comparison.
      */
-    public function like(string $x, $y/*, ?string $escapeChar = null */) : string
+    public function like(string $x, $y, ?string $escapeChar = null) : string
     {
         return $this->comparison($x, 'LIKE', $y) .
-            (func_num_args() >= 3 ? sprintf(' ESCAPE %s', func_get_arg(2)) : '');
+            ($escapeChar !== null ? sprintf(' ESCAPE %s', $escapeChar) : '');
     }
 
     /**
-     * Creates a NOT LIKE() comparison expression with the given arguments.
+     * Creates a NOT LIKE comparison expression
      *
      * @param string $x Field in string format to be inspected by NOT LIKE() comparison.
      * @param mixed  $y Argument to be used in NOT LIKE() comparison.
      */
-    public function notLike(string $x, $y/*, ?string $escapeChar = null */) : string
+    public function notLike(string $x, $y, ?string $escapeChar = null) : string
     {
         return $this->comparison($x, 'NOT LIKE', $y) .
-            (func_num_args() >= 3 ? sprintf(' ESCAPE %s', func_get_arg(2)) : '');
+            ($escapeChar !== null ? sprintf(' ESCAPE %s', $escapeChar) : '');
     }
 
     /**