Delve into PHP's foreach

Delve into PHP's foreach
1, foreach Introduction-http://segmentfault.com/a/1190000004340467
2. Deepen the understanding of foreach-http://segmentfault.com/a/1190000004340504
3. The Foreach loop dynamically adds data to the array-http://segmentfault.com/a/1190000004340566
4. When the Foreach loop moves the pointer, assigns the value, executes the loop body order-http://segmentfault.com/a/1190000004340590
5. When the Foreach loop calls the current function-http://segmentfault.com/a/1190000004340604
6. Use trap for two-time foreach-http://segmentfault.com/a/1190000004340634
Technical level is limited, welcome to correct me, thank you very much

