php man page for is_executable

IS_EXECUTABLE(3)							 1							  IS_EXECUTABLE(3)

is_executable - Tells whether the filename is executable

SYNOPSIS
       bool is_executable (string  $filename)

DESCRIPTION
	Tells whether the filename is executable.

PARAMETERS
	      o $filename
		- Path to the file.

RETURN VALUES
	Returns TRUE if the filename exists and is executable, or FALSE on error.

EXAMPLES
       Example #1

	      is_executable(3) example

	      <?php

	      $file = '/home/vincent/somefile.sh';

	      if (is_executable($file)) {
		  echo $file.' is executable';
	      } else {
		  echo $file.' is not executable';
	      }

	      ?>

ERRORS
/EXCEPTIONS
	Upon failure, an E_WARNING is emitted.

NOTES
       Note

	      The results of this function are cached. See clearstatcache(3) for more details.

       Tip

	      As  of  PHP  5.0.0,  this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine
	      which wrappers support stat(3) family of functionality.

SEE ALSO
       is_file(3), is_link(3).

PHP Documentation Group 													  IS_EXECUTABLE(3)