1. PHP entry two-dimensional arrays and loops

1<?PHP2 $two=Array(Array(2,3),1=>Array(,2=>)Array(4,5,6));3     Echo $two[1] [0];//Output 14     Echo $two[0] [0];//Output 25     Echo"\ r \ n";6     foreach($two  as $key=$value)//Two-dimensional cyclic output7     {8         Echo $value;9         Echo"\ r \ n";Ten         foreach($value  as $key=$value) One         { A             Echo $value." \ r \ n ";//use + number error -         } -     } the?>

PHP "+" is used as an operation, the result of the operation must be a value, and not like JS inside the "+" number for stitching.
There will be a warning, a non-numeric value encountered, but \ r \ n still works.

1. PHP entry two-dimensional arrays and loops