php file_exists function to check whether a file or directory exists_PHP tutorial

Description
bool file_exists ( string $filename )

Returns TRUE if the file or directory specified by filename exists, otherwise returns FALSE.

In fact, we have already talked about the file_exists function and file_exists syntax in the PHP tutorial. Let’s take a look at its usage and examples.

The file or directory of the path.

On Windows, use //computername/share/filename or computernameshare filename to check for network shared files.
In Windows, use //computername/share/filename or \computernamesharefilename to check shared files on the network.

This is a very simple example -

Copy code The code is as follows:

< ;?php
$filename = '/jb51.net/aa/to/foo.txt';
if (file_exists($filename)) {
echo "File $filename exists";
} else {
echo "File $filename does not exist";
}
?>

The output result is:

File/jb51.net/ aa/to/foo.txt already exists

Let’s take a look at Example 2

Copy the code The code is as follows:

echo file_exists("jb51.net.txt");
?>

For this we will directly use file_exists to return true or false

http://www.bkjia.com/PHPjc/321791.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/321791.htmlTechArticleDescription bool file_exists ( string $filename ) Returns TRUE if the file or directory specified by filename exists, otherwise returns FALSE . In fact, in the php tutorial file_exists function and file_ex...