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:
- An E_WARNING is emitted on failure.
- 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
<?php $myfile = "gfg" ;
// checking whether the file is a symbolic link or not if ( is_link ( $mylink )) {
echo ( "$mylink is a symbolic link!" );
} else {
echo ( "$mylink is not a symbolic link!" );
} ?> |
Output:
gfg is a symbolic link!
Program 2
<?php $myfile = "gfg" ;
// checking whether the file // is a symbolic link or not if ( is_link ( $mylink )) {
echo ( "$mylink is a symbolic link!" );
// Reading the link
echo "Reading the link :\n" ;
echo ( readlink ( $mylink ));
} // creating a symbolic link of the // file if it doesn't exist else {
symlink( "gfg" , $mylink );
} ?> |
Output:
gfg is a symbolic link! Reading the link : A portal for geeks!
Reference:
http://php.net/manual/en/function.is-link.php