is_writeable_ACLSafe() │ WPSCache 1.0

from legolas558 d0t users dot sf dot net at http://www.php.net/is_writable

No Hooks.

Return

null. Nothing (null).

Usage

is_writeable_ACLSafe( $path );
$path (required)
-

is_writeable_ACLSafe() code WPSCache 1.12.0

wp-super-cache/wp-cache-phase2.php 
function is_writeable_ACLSafe( $path ) {

	if (
		( defined( 'PHP_OS_FAMILY' ) && 'Windows' !== constant( 'PHP_OS_FAMILY' ) ) ||
		stristr( PHP_OS, 'DAR' ) ||
		! stristr( PHP_OS, 'WIN' )
	) {
		return is_writable( $path );
	}

	// PHP's is_writable does not work with Win32 NTFS

	if ( $path[ strlen( $path ) - 1 ] == '/' ) { // recursively return a temporary file path
		return is_writeable_ACLSafe( $path . uniqid( mt_rand() ) . '.tmp' );
	} elseif ( is_dir( $path ) ) {
		return is_writeable_ACLSafe( $path . '/' . uniqid( mt_rand() ) . '.tmp' );
	}

	// check tmp file for read/write capabilities
	$rm = file_exists( $path );
	$f  = @fopen( $path, 'a' );
	if ( $f === false ) {
		return false;
	}
	fclose( $f );
	if ( ! $rm ) {
		unlink( $path );
	}

	return true;
}