Hello World
Warning: Array to string conversion in /in/difoo on line 6
Warning: Array to string conversion in /in/difoo on line 6
Warning: Undefined variable $a in /in/difoo on line 7
NULL
Hello World
Notice: Array to string conversion in /in/difoo on line 6
Notice: Array to string conversion in /in/difoo on line 6
Notice: Undefined variable: a in /in/difoo on line 7
NULL
Hello World
Notice: Array to string conversion in /in/difoo on line 6
Notice: Array to string conversion in /in/difoo on line 6
Notice: Array to string conversion in /in/difoo on line 6
Notice: Array to string conversion in /in/difoo on line 6
Notice: Undefined variable: a in /in/difoo on line 7
NULL