Vetrivel Samidurai

Hi Akansha, I am a Professional Sr PHP Developer from Bangalore (India) developed lot of web applications, e-commerce websites and web portals. Have 4.9 Yrs hands on lab experience of the following technologies html, css, javascript, jQuery, Angularjs, PHP, Mysql, json, xml, RESTAPI, Payment gateway integration etc. Surely i will help you to learn PHP, Mysql in a better manner.

switch statement is generally best to use when you have more than two conditional expressions based on a single variable of numeric type. For instance, rather than the code if (x == 1) printf(“x is equal to one.\n”); else if (x == 2) printf(“x is equal to two.\n”); else if (x == 3) printf(“x is equal to three.\n”); else printf(“x is not equal to one, two, or three.\n”); the following code is easier to read and maintain: switch (x) { case 1: printf(“x is equal to one.\n”); break; case 2: printf(“x is equal to two.\n”); break; case 3: printf(“x is equal to three.\n”); break; default: printf(“x is not equal to one, two, or three.\n”); break; } Notice that for this method to work, the conditional expression must be based on a variable of numeric type in order to use the switch statement. Also, the conditional expression must be based on a single variable. For instance, even though the following if statement contains more than two conditions, it is not a candidate for using a switch statement because it is based on string comparisons and not numeric comparisons: char* name = “Lupto”; if (!stricmp(name, “Isaac”)) printf(“Your name means ‘Laughter’.\n”); else if (!stricmp(name, “Amy”)) printf(“Your name means ‘Beloved’.\n “); else if (!stricmp(name, “Lloyd”)) printf(“Your name means ‘Mysterious’.\n “); else printf(“I haven’t a clue as to what your name means.\n”)

I assume you work on linux. First setup your serial port: stty -F /dev/ttyACM0 cs8 9600 ignbrk -brkint -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts Then you can use good old fashion fread/fwrite $fp =fopen("/dev/ttyACM0", "w+"); if( !$fp) { echo "Error";die(); } fwrite($fp, $_SERVER['argv'][1] . 0x00); echo fread($fp, 10); fclose($fp); There is only one thing you have to remember. Arduino will restart on every connection. If you don't know that It will confuse you. For instance if you connect (fopen) and instantly send data Arduino will miss it because it's booting (which takes a sec or two). Experiment with sleep to give it some time. If you want to disable restarting use 10uF capacitor from GRD to RST. Good luck ps. you can troubleshoot with "screen" screen /dev/ttyACM0 9600 https://systemsarchitect.net/2013/02/21/arduino-and-php-serial-communication-with-a-protocol/

File handling is an important part of any web application. You often need to open and process a file for different tasks. PHP has several functions for creating, reading, uploading, and editing files. When you are manipulating files you must be very careful. You can do a lot of damage if you do something wrong. Common errors are: editing the wrong file, filling a hard-drive with garbage data, and deleting the content of a file by accident. Example: