Reflection of a point at 180 degree rotation of another point | PHP Program for find the 180 degree reflection of one point around another point . ; Driver Code
< ? php function findPoint ( $ x1 , $ y1 , $ x2 , $ y2 ) { echo " ( " , 2 * $ x2 - $ x1 , " , ▁ " , 2 * $ y2 - $ y1 , " ) " ; } $ x1 = 0 ; $ y1 = 0 ; $ x2 = 1 ; $ y2 = 1 ; findPoint ( $ x1 , $ y1 , $ x2 , $ y2 ) ; ? >