PHP provide function to execute code, compile as well as generate output as per your requiment Following function is use for daily software development : 1-ucfirst() 2-ucwords() 3-substr() 4-is_numeric() 5-number_format() 6-rand() 7-round() 8-pi() 9-tan() 10-sin() 11- date() 12-strip_tags() 13-array_rotate() 14-array_diff() 15-print_r() 16-echo() 17-is_object() 18-is_array() 19-in_array() 20-array_chunk() 21-array_reverse() above function is used for any string as well as array operation if you have any query reply on below mail id : disuzajen@gmail.com