PHP File Handling Tutorial – File is collections of characters, words, lines, paragraphs and pages from a textual document
A text file can be a stream of characters that a computer can process sequentially. It is not only processed sequentially but only in forward direction. For this reason a text file is usually opened for only one kind of operation (reading, writing, or appending) at any given time. In PHP a file is created using touch() function.
Example:-
pro1.php
<?php
touch(“abc.txt”);
echo “File created”;
?>
In the example abc.txt file create. If you want to create a file in particular directory, so mention
It’s path. As for example ,if you want to create file in data directory which is located in your project directory.
Example:-
pro2.php
<?php
touch(“data/abc.txt”);
echo “File created”;
?>
Now we will try to write some data on existing file. So first of all open the file . in PHP fopen() function is used to open a file. It takes two parameter file name and purpose to open.
Syntax-foen(“file name”,”mode (read/write/append)”)
Second parameter is also called mode.
Mode Definition
————————
r- read
w- write
a- append
now we want to write some thing on abc.txt. so open file in write mode . foen(“data/abc.txt”,’w’) function open the file in write mode and return address where file is opened in memory. Now all process will complete on that pointer variable. Try to understand the following example.
pro3.php
<?php
$fp=fopen(“data/”.”abc.txt”,’w’);
fwrite($fp,”welcome”);
echo “Data inserted”;
?>
Reading data from a file . fread() function is used for reading data from file, it takes two parameter as file handler and size(in character).
pro4.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
$data=fread($fp,20);
echo $data;
?>
In the above example we have pass 20 in fread () function as second argument. It maean fread will read only 20 character from $fp handler. If we want to read complete file then how it possible.
Following example illustrate how a complete will read. For reading the complete file we have need size of complete file. filesize() is a function which takes file name as a parameter and return file size in character.
Example:-
pro5.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
$size=filesize(“data/abc.txt”);
$data=fread($fp,$size);
echo $data;
?>
fgetc()- is a function which return single character from handler and place the file pointer to next .
Example:-
pro6.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
$data=fgetc($fp);
echo $data;
?
feof()- is a function which takes file handler as a parameter and return true if the control reach at the end of file.
Example:-
pro7.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
if(!feof($fp))
echo”True”;
else
echo”False”;
?>
PHP reading a file character by character using fgetc() and feof() function.
pro8.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
while(!feof($fp))
{
$data=fgetc($fp);
echo $data;
}
?>
PHP Reading a file line by line using fgets() function
pro9.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
while(!feof($fp))
{
$data=fgets($fp);
echo $data;
}
?>
ftell():- function return the position of pointer in file
pro10.php
<?php
$fp=fopen(“data/abc.txt”,’r’);
while(!feof($fp))
{
$data=fgetc($fp);
echo $data.”=”.ftell($fp).”<br>”;
}
?>
PHP Appending data in a file
pro11.php
<?php
$fp=fopen(“data/”.”abc.txt”,’a’);
fwrite($fp,”welcome”);
echo “Data Updated”;
?>
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