phponlinetutorial

file_put_contents in php example :-  to put the new content using this function it remove the previous content of a file.

file_get_contents in php  :- by using this function we can get the content of a file with out file pointer.

this function returns the Boolean values if the file pointer is located at the beginning of the file. <?php $fp = fopen("myfile.txt","r"); $count=0; while(!feof($fp)) { echo fgets($fp); $count++; } echo "<br>" total lines are $count"; ?>

it is same as fgets. but it ignores the html elements.

by using this function we can read a line from a file & we can move the file pointer at the beging of the next line.

fseek function in php: by using this function we can locate the file pointer on the specified location. <?php $fp= fopen("myfile.text",' w+'); fwrite ($fp, "hello scott"); fseek($fp,2); $size= file size("myfile.text"); echo fread($fp,$size); ?>

file size in php file handling returns the total number of bytes occupied by file.

f-write in php file handling  to write the contents in a file arguments are file pointer, new content.

f-read in php file handling    used to read the file contents the arguments are file pointer, file size.

f-open in php file handling this function is used to open a file.

file handling in php example by using this concept we can read a content of a file and we can write the content in a files. to read and write the contents first. we have to open the file using a file mode

ini_set() function in php   by using this function to change the value of configuration directives. 

ini_get() function in php by using this function we can get the value of configuration directives.

phpinfo() function in php example                                                          by using this function we can display the all configuration directives on web page <?php phpinfo(); ?> 

$_ENV  in php example :-                                           by using this super global variable we can get the information of environmental variables  environmental variables are nothing but the o/s variables.

configuration directives to work with session. 1. session.auto_start:-                               by using this directives we can  initialize the session. when the request is started. the default value is 0. by changing the value as 1 we can initialize the session. 2. session.save_handler - handles used to store the retrieve the session the default value is files. 3. session.save_path:-                                    provide the path where you want to save the session. 4. session.use_cookies                                        weather to use cookie or not to store the session.   

difference between cookie and session in php cookie :-  1. cookie reside in client system. 2 cookie store small amount of data. 3.cookie are not secured. 4. cookie can store only text data. 5. cookie are burden in client system. session:- 1. session reside web server. 2. session can store huge amount of data. 3. session are secured. 4. session store any type of data.  

by using this super global variable we can create the session and we can read the session.  session are using to maintain the state of an application. there reside in web server.

query string is a small amount of data on the url address followed by ? mark. along with the input control values if you want to send some extra information form one page to another page. we are using query string is the combination of name and value. <form method ="post" action="page1.php?city=hyd&inst=php"> <input type="text" name="text1"></br> <input type="submit" value="submit" name="submit"> </form> <?php echo $_request['city']; echo $_request['inst']; echo $_request['text1'];  ?>