View Compilation Error

0_0_32415468_25131.cpp:1:1: error: expected unqualified-id before '<' token
 <?php
 ^
0_0_32415468_25131.cpp:6:1: error: expected unqualified-id before 'if'
 if( ! isset( $_POST[ 'token' ] ) )
 ^
0_0_32415468_25131.cpp:9:1: error: '$user' does not name a type
 $user = decode_token( $_POST['token'] );
 ^
0_0_32415468_25131.cpp:11:1: error: expected unqualified-id before 'if'
 if( $user -> is_admin() ) {
 ^
0_0_32415468_25131.cpp:46:1: error: expected unqualified-id before 'else'
 else
 ^
0_0_32415468_25131.cpp:49:1: error: 'echo' does not name a type
 echo json_encode( array( "code" => 1, "messages" => "Success." ) );
 ^