PHP | is_link( ) Function
Last Updated :
05 Jun, 2018
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" ;
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" ;
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!
Reference:
http://php.net/manual/en/function.is-link.php
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