File handling is an essential part of programming that allows applications to create, read, update, and delete files. File Read\/Write operations help developers store data permanently and manage information efficiently.<\/p>\n\n\n\n
In PHP, file handling functions make it easy to work with text files, logs, reports, configuration files, and user-generated content.<\/p>\n\n\n\n
By the end of this training, you will be able to:<\/p>\n\n\n\n
File Read\/Write refers to the process of accessing file content for reading information or storing data into files.<\/p>\n\n\n\n
Used to retrieve data stored inside a file.<\/p>\n\n\n\n
Used to create new content or update existing file content.<\/p>\n\n\n\n
File handling is important because it helps developers:<\/p>\n\n\n\n
Used to open a file.<\/p>\n\n\n\n
<?php
$file = fopen(\"data.txt\", \"r\");
?><\/code><\/pre>\n\n\n\nfclose()<\/h3>\n\n\n\n
Used to close a file after use.<\/p>\n\n\n\n
<?php
fclose($file);
?><\/code><\/pre>\n\n\n\nfread()<\/h3>\n\n\n\n
Reads data from a file.<\/p>\n\n\n\n
<?php
$file = fopen(\"data.txt\", \"r\");
echo fread($file, filesize(\"data.txt\"));
fclose($file);
?><\/code><\/pre>\n\n\n\nfwrite()<\/h3>\n\n\n\n
Writes data into a file.<\/p>\n\n\n\n
<?php
$file = fopen(\"data.txt\", \"w\");
fwrite($file, \"Welcome to PHP File Handling\");
fclose($file);
?><\/code><\/pre>\n\n\n\nFile Modes in PHP<\/h2>\n\n\n\nRead Mode<\/h3>\n\n\n\nr<\/code><\/pre>\n\n\n\nOpens a file for reading only.<\/p>\n\n\n\n
Write Mode<\/h3>\n\n\n\nw<\/code><\/pre>\n\n\n\nOpens a file for writing and clears existing content.<\/p>\n\n\n\n
Append Mode<\/h3>\n\n\n\na<\/code><\/pre>\n\n\n\nAdds new content at the end of the file.<\/p>\n\n\n\n
Read and Write Mode<\/h3>\n\n\n\nr+<\/code><\/pre>\n\n\n\nAllows both reading and writing.<\/p>\n\n\n\n
Reading Files Line by Line<\/h2>\n\n\n\n<?php
$file = fopen(\"data.txt\", \"r\");
while(!feof($file)) {
echo fgets($file);
}
fclose($file);
?><\/code><\/pre>\n\n\n\nAppending Data to a File<\/h2>\n\n\n\n<?php
$file = fopen(\"data.txt\", \"a\");
fwrite($file, \"\\nNew Record Added\");
fclose($file);
?><\/code><\/pre>\n\n\n\nChecking if a File Exists<\/h2>\n\n\n\n<?php
if(file_exists(\"data.txt\")) {
echo \"File Exists\";
} else {
echo \"File Not Found\";
}
?><\/code><\/pre>\n\n\n\nCreating a New File<\/h2>\n\n\n\n<?php
$file = fopen(\"newfile.txt\", \"w\");
fclose($file);
?><\/code><\/pre>\n\n\n\nDeleting a File<\/h2>\n\n\n\n<?php
unlink(\"oldfile.txt\");
?><\/code><\/pre>\n\n\n\nFile Handling Best Practices<\/h2>\n\n\n\n\n- Always close files after use<\/li>\n\n\n\n
- Check if files exist before reading<\/li>\n\n\n\n
- Use proper file permissions<\/li>\n\n\n\n
- Validate user input for file operations<\/li>\n\n\n\n
- Avoid overwriting important files<\/li>\n\n\n\n
- Handle errors properly<\/li>\n<\/ul>\n\n\n\n
Advantages of File Read\/Write<\/h2>\n\n\n\n\n- Permanent data storage<\/li>\n\n\n\n
- Easy report generation<\/li>\n\n\n\n
- Improved application management<\/li>\n\n\n\n
- Efficient log handling<\/li>\n\n\n\n
- Better data organization<\/li>\n<\/ul>\n\n\n\n
Real World Applications<\/h2>\n\n\n\n
File handling is used in:<\/p>\n\n\n\n
\n- Student management systems<\/li>\n\n\n\n
- Attendance systems<\/li>\n\n\n\n
- Website logs<\/li>\n\n\n\n
- Report generation tools<\/li>\n\n\n\n
- Content management systems<\/li>\n\n\n\n
- Backup systems<\/li>\n<\/ul>\n\n\n\n
Practical Exercise<\/h2>\n\n\n\n
Create a PHP application that:<\/p>\n\n\n\n
\n- Creates a text file<\/li>\n\n\n\n
- Stores student records<\/li>\n\n\n\n
- Reads and displays stored data<\/li>\n\n\n\n
- Appends new records<\/li>\n\n\n\n
- Deletes unwanted files<\/li>\n<\/ul>\n\n\n\n
Final Presentation<\/h2>\n\n\n\n
In your final presentation, explain:<\/p>\n\n\n\n
\n- What File Read\/Write means<\/li>\n\n\n\n
- Importance of file handling<\/li>\n\n\n\n
- Common PHP file functions<\/li>\n\n\n\n
- File modes and their uses<\/li>\n\n\n\n
- Reading and writing operations<\/li>\n\n\n\n
- Real-world applications of file handling<\/li>\n<\/ul>\n\n\n