PHP | is_link( ) Function

The is_link() function in PHP used to check whether the specified file is a symbolic link or not. The path to the file is sent as a parameter to the is_link() function and it returns TRUE if the filename exists and is a symbolic link, otherwise it returns FALSE. Syntax:

is_link(file)

Parameters Used: The is_link() function in PHP accepts only one parameter.

• file : It is a mandatory parameter which specifies the path of the file.

Return Values: It returns TRUE if the filename exists and is a symbolic link, otherwise it returns FALSE. Exceptions:

1. An E_WARNING is emitted on failure.
2. The result of this function are cached and therefore the clearstatcache() function is used to clear the cache.

Examples:

Input : $mylink = "gfg";
 if(is_link($mylink))
 {
 echo ("$mylink is a symbolic link!");
 }
 else
 {
 echo ("$mylink is not a symbolic link!");
 }

Output : gfg is a symbolic link!

Input : $mylink = "gfg";
 if (is_link($mylink)) 
 {
 echo ("$mylink is a symbolic link!");
 echo "Reading the link :\n";
 echo(readlink($mylink));
 }
 else 
 {
 symlink("gfg", $mylink);
 }
Output : gfg is a symbolic link!
 Reading the link :
 A portal for geeks!

Below programs illustrate the is_link() function. Program 1 Output:

gfg is a symbolic link!

Program 2 Output:

gfg is a symbolic link!
Reading the link :
A portal for geeks!

Reference: https://www.php.net/manual/en/function.is-link.php