Akash SathvaraFile Handling
Opening/Making a File
The fopen() function is used to open files in PHP.
<?php
$file=fopen("demo.txt","w");
fwrite($file,'Akash');
fwrite($file,'Sathvara');
fclose($file);
?>
In ‘demo.txt’ file the data will be,
Note:
- When you want to write in a file, then it should not be in read mode.
- Octal value for permissions –> read-444, write-222, execute-111, read/write/execute-777
A list of possible modes for fopen() :
Writing in File
If you want to add a new data in the old file then you have to use ‘a’ (append) mode.
<?php
$filename = 'test.txt';
$somecontent = "Akash Sathvara\n";
//if mode 'a', then everytime new contents will be written.
//but when mode is 'w', then the contents will be added and
//will not delete the old data.
fopen($filename,'a');
//is_writable() will check the file is writable or not
if (is_writable($filename)) {
if (!$handle = fopen($filename, 'a')) {
echo "Cannot open file ($filename)";
exit;
}
//fwrite() and fputs() is used to write in a file
if (fwrite($handle, $somecontent) === FALSE) {
echo "Cannot write to file ($filename)";
exit;
}
echo "Success, wrote ( $somecontent) to file ($filename)";
//fclose() is used to close the file
fclose($handle);
} else {
echo "The file $filename is not writable";
}
//unlink() will deletes the file
//unlink($filename);
echo "<pre>";
//file() will read a file into an array
print_r(file($filename));
?>
In ‘test.txt’ file the data will be,
Akash Sathvara
Reading a File
If you want to read a file(demo.txt) line by line, you have to use fgets() or fread().
<?php
unset($file1);
error_reporting();
$file1 = fopen("file_function/demo.txt", "r") or exit("Unable to open file!");
//feof() check the file until the end is reached
while(!feof($file1))
{
//fgets() will read a file line by line
echo fgets($file1)."<br>";
}
fclose($file1);
?>
Ouput :
If you want to read a file(demo.txt) character by character, you have to use fgetc().
<?php
$file
= fopen("file_function/demo.txt", "r") or exit("Unable to open file!");
//feof() check the file until the end is reached
while(!feof($file))
{
//fgetc() will read a file character by character
echo fgetc($file)."<br>";
}
fclose($file);
?>
Ouput :
Making a CSV File
If you want to make a .csv file(csvfile.csv), you have to use fputcsv().
<?php
$list = array(
array('hitesh','sunny','nirav','hemraj'),
array('gandhinagar','ahmedabad','rajkot'),
array('"batch1"','"batch2"')
);
$fp = fopen('file_function/csvfile.csv','w');
foreach($list as $fields) {
fputcsv($fp, $fields);
}
fclose($fp);
?>
In ‘csvfile.csv’ file the data will be,
Reading a CSV File
If you want to read a .csv file(csvfile.csv), you have to use fgetcsv().
<?php
$row=1;
if (($handle = fopen("file_function/csvfile.csv","r")) !== FALSE) {
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
$num = count($data);
echo "$num fields in line $row: <br />=================<br />";
$row++;
for ($c=0; $c < $num; $c++) {
echo $data[$c] . "<br />\n";
}
echo "<br />";
}
fclose($handle);
}
?>
Output :
learn2php 