Using PHP is_link() to Detect Symbolic Links

The is_link() function in PHP determines whether a specified filename refers to a symbolic link.

Parameter: $filename – the path of the file to be checked.

Return value: Returns TRUE if the file exists and is a symbolic link; otherwise returns FALSE.

Example 1:

<?php
$link = 'uploads';
if (is_link($link)) {
    echo readlink($link);
} else {
    symlink('uploads.php', $link);
}
?>

Example 2:

<?php
$link = "images";
if (is_link($link)) {
    echo "$link is a link";
} else {
    echo "$link is not a link";
}
?>

Output:

// images is not a link