--TEST-- Test N++ operator : various numbers as strings --FILE-- <?php $strVals = array( "0","65","-44", "1.2", "-7.7", "abc", "123abc", "123e5", "123e5xyz", " 123abc", "123 abc", "123abc ", "3.4a", "a5.9" ); foreach ($strVals as $strVal) { echo "--- testing: '$strVal' ---\n"; $strVal++; var_dump($strVal); } ?> --EXPECT-- --- testing: '0' --- int(1) --- testing: '65' --- int(66) --- testing: '-44' --- int(-43) --- testing: '1.2' --- float(2.2) --- testing: '-7.7' --- float(-6.7) --- testing: 'abc' --- string(3) "abd" --- testing: '123abc' --- string(6) "123abd" --- testing: '123e5' --- float(12300001) --- testing: '123e5xyz' --- string(8) "123e5xza" --- testing: ' 123abc' --- string(7) " 123abd" --- testing: '123 abc' --- string(7) "123 abd" --- testing: '123abc ' --- string(7) "123abc " --- testing: '3.4a' --- string(4) "3.4b" --- testing: 'a5.9' --- string(4) "a5.0"