Chris@0: isset() and empty()
Chris@0: -----
Chris@0: <?php
Chris@0: isset($a);
Chris@0: isset($a, $b, $c);
Chris@0: 
Chris@0: empty($a);
Chris@0: empty(foo());
Chris@0: empty(array(1, 2, 3));
Chris@0: -----
Chris@0: array(
Chris@13:     0: Stmt_Expression(
Chris@13:         expr: Expr_Isset(
Chris@13:             vars: array(
Chris@13:                 0: Expr_Variable(
Chris@13:                     name: a
Chris@13:                 )
Chris@13:             )
Chris@13:         )
Chris@13:     )
Chris@13:     1: Stmt_Expression(
Chris@13:         expr: Expr_Isset(
Chris@13:             vars: array(
Chris@13:                 0: Expr_Variable(
Chris@13:                     name: a
Chris@13:                 )
Chris@13:                 1: Expr_Variable(
Chris@13:                     name: b
Chris@13:                 )
Chris@13:                 2: Expr_Variable(
Chris@13:                     name: c
Chris@13:                 )
Chris@13:             )
Chris@13:         )
Chris@13:     )
Chris@13:     2: Stmt_Expression(
Chris@13:         expr: Expr_Empty(
Chris@13:             expr: Expr_Variable(
Chris@0:                 name: a
Chris@0:             )
Chris@0:         )
Chris@0:     )
Chris@13:     3: Stmt_Expression(
Chris@13:         expr: Expr_Empty(
Chris@13:             expr: Expr_FuncCall(
Chris@13:                 name: Name(
Chris@13:                     parts: array(
Chris@13:                         0: foo
Chris@13:                     )
Chris@13:                 )
Chris@13:                 args: array(
Chris@13:                 )
Chris@0:             )
Chris@0:         )
Chris@0:     )
Chris@13:     4: Stmt_Expression(
Chris@13:         expr: Expr_Empty(
Chris@13:             expr: Expr_Array(
Chris@13:                 items: array(
Chris@13:                     0: Expr_ArrayItem(
Chris@13:                         key: null
Chris@13:                         value: Scalar_LNumber(
Chris@13:                             value: 1
Chris@13:                         )
Chris@13:                         byRef: false
Chris@0:                     )
Chris@13:                     1: Expr_ArrayItem(
Chris@13:                         key: null
Chris@13:                         value: Scalar_LNumber(
Chris@13:                             value: 2
Chris@13:                         )
Chris@13:                         byRef: false
Chris@0:                     )
Chris@13:                     2: Expr_ArrayItem(
Chris@13:                         key: null
Chris@13:                         value: Scalar_LNumber(
Chris@13:                             value: 3
Chris@13:                         )
Chris@13:                         byRef: false
Chris@0:                     )
Chris@0:                 )
Chris@0:             )
Chris@0:         )
Chris@0:     )
Chris@0: )