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Description

Tests if a given filesystem path is absolute.

For example, '/foo/bar', or 'c:\windows'.

Usage

$bool = path_is_absolute( $path );

Parameters

$path

( string ) required – File path.

Returns

bool True if path is absolute, false is not absolute.

Source

File name: wordpress/wp-includes/functions.php
Lines:

function path_is_absolute( $path ) {
  /*
	 * Check to see if the path is a stream and check to see if its an actual
	 * path or file as realpath() does not support stream wrappers.
	 */
  if ( wp_is_stream( $path ) && ( is_dir( $path ) || is_file( $path ) ) ) {
    return true;
  }

  /*
	 * This is definitive if true but fails if $path does not exist or contains
	 * a symbolic link.
	 */
  if ( realpath( $path ) === $path ) {
    return true;
  }

  if ( strlen( $path ) === 0 || '.' === $path[0] ) {
    return false;
  }

  // Windows allows absolute paths like this.
  if ( preg_match( '#^[a-zA-Z]:\\\\#', $path ) ) {
    return true;
  }

  // A path starting with / or \ is absolute; anything else is relative.
  return ( '/' === $path[0] || '\\' === $path[0] );
}
 

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