(PHP 5)
DirectoryIterator::isExecutable — Determine if current DirectoryIterator item is executable
Determines if the current DirectoryIterator item is executable.
This function has no parameters.
   Returns TRUE if the entry is executable, otherwise FALSE
  
Example #1 DirectoryIterator::isExecutable() example
This example lists files in the directory containing the script which are executable.
<?php
$iterator = new DirectoryIterator(dirname(__FILE__));
foreach ($iterator as $fileinfo) {
    if ($fileinfo->isExecutable()) {
        echo $fileinfo->getFilename() . "\n";
    }
}
?>
The above example will output something similar to:
example.php myscript.sh