PHP overview

What is php ..?
PHP is probably the most popular scripting language on the web. It is used to enhance web pages.
PHP has four different variable scopes:
• local


• global


• static


• parameter


Learn how to create a website design templating system using php to be able to easily update different sections on your website by changing ...
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open files ko reference karne ke liye php file pointer ka use karta hai. we can create a new file pointer by using fopen(). This function takes, at minimum, two parameters: filename is the file that you wish to open, and mode is the mode you wish to open it with. . There are eight different modes that you can use to open a file:
Mode Description r Open for reading only; place the file pointer at the beginning of the file. r+ Open for reading and writing; place the file pointer at the beginning of the file. w Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it. w+ Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it. a Open for writing only; place the file pointer at the end of the file. If the file does not exist, attempt to create it. a+ Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it. x Create and open for writing only; place the file pointer at the beginning of the file. x+ Create and open for reading and writing; place the file pointer at the beginning of the file. 
functions required to read a file with PHP. fopen() function. filesize() function. fread() function. fclose() function.
example!!


<?php
$filename = "/home/user/guest/tmp.txt";
$file = fopen( $filename, "r" );
if( $file == false )
{
   echo ( "Error in opening file" );
   exit();
}
$filesize = filesize( $filename );
$filetext = fread( $file, $filesize );


fclose( $file );


echo ( "File size : $filesize bytes" );
echo ( "<pre>$filetext</pre>
" );
?>