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PHP File Handling
Reading a File:
PHP provides several functions to read files. The simplest way is using the file_get_contents() function which reads the entire file into a string.
<?php
$content = file_get_contents("example.txt");
echo $content;
?>
Opening a File:
To open a file, use the fopen() function, which returns a file pointer resource on success.
<?php
$file = fopen("example.txt", "r");
if ($file) {
echo "File opened successfully.";
}
?>
Reading a File Line by Line:
The fgets() function is used to read a file line by line.
<?php
$file = fopen("example.txt", "r");
while (($line = fgets($file)) !== false) {
echo $line;
}
fclose($file);
?>
Writing to a File:
The fwrite() function is used to write data to a file.
<?php
$file = fopen("example.txt", "w");
fwrite($file, "Hello, World!");
fclose($file);
?>
Appending to a File:
To append data to a file, open it in append mode using "a".
<?php
$file = fopen("example.txt", "a");
fwrite($file, "Appended text.");
fclose($file);
?>
Checking if a File Exists:
Use the file_exists() function to check if a file exists.
<?php
if (file_exists("example.txt")) {
echo "File exists.";
} else {
echo "File does not exist.";
}
?>
Deleting a File:
The unlink() function is used to delete a file.
<?php
if (unlink("example.txt")) {
echo "File deleted.";
} else {
echo "File could not be deleted.";
}
?>
Getting File Size:
Use the filesize() function to get the size of a file in bytes.
<?php
$size = filesize("example.txt");
echo "File size: " . $size . " bytes";
?>
Getting File Type:
The filetype() function returns the type of the file.
<?php
$type = filetype("example.txt");
echo "File type: " . $type;
?>
Copying a File:
To copy a file, use the copy() function.
<?php
if (copy("example.txt", "example_copy.txt")) {
echo "File copied.";
} else {
echo "File could not be copied.";
}
?>
