Operation examples of creating files (folders) and directories with PHP_PHP tutorial

1. Directory operation

The first is the function to read from the directory, opendir(), readdir(), closedir(). When used, the file handle is opened first, and then iteratively listed :
<?php
$base_dir="liehuonet/";
$fso=opendir($base_dir);
echo $base_dir."<hr/>";
while($flist=readdir($fso)){
echo $flist."<br/>";
}
closedir($fso)
?>
this It is a program that returns the files and directories under the file directory (0 files will return false).

Sometimes you need to know the directory information, you can use dirname($path) and basename($path) to return respectively For the directory part and file name part of the path, disk_free_space($path) can be used to return the remaining space of the view space.

Creation command:

mkdir($path,0777): 0777 is the permission code, It can be set with the umask() function under non-window conditions.

rmdir($path): will delete files with paths in $path.

2. File operations

● New File

First, determine the permissions of the directory where the file you want to create is located; the recommended device is 777. Then, it is recommended to use an absolute path for the name of the new file.
<?php
$filename="test.txt";
$fp=fopen("$filename", "w+"); //Open the file pointer and create the file
if ( !is_writable($filename) ){
die("File:" .$filename. "Not writable, please check!");
}
//fwrite($filename, "anything you want to write to $filename.";
fclose($fp); //Close the pointer

● Read the file

First, check whether a file can be read (permission issue), or Yes, we can use the is_readable function to get the information.:

<?php
$file = 'dirlist.php';
if (is_readable($file) == false) {
die('The file does not exist or cannot be read');
} else {
echo 'exists';
}
?>

Function to determine the existence of the file There is also file_exists (demonstrated below), but this is obviously not as comprehensive as is_readable. When a file exists, you can use

<?php
$file = "filelist.php";
if ( file_exists($file) == false) {
die('File does not exist');
}
$data = file_get_contents($file);
echo htmlentities($data);
?>
However, the file_get_contents function is not supported on lower versions. You can first create a handle to the file, and then use the pointer to read all:

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