[trevor-mills]

Within WordPress, there’s also the very handy function wp_mkdir_p which will recursively create a directory structure.

Source for reference:

function wp_mkdir_p( $target ) {
    $wrapper = null;

    // Strip the protocol
    if( wp_is_stream( $target ) ) {
        list( $wrapper, $target ) = explode( '://', $target, 2 );
    }

    // From php.net/mkdir user contributed notes
    $target = str_replace( '//', '/', $target );

    // Put the wrapper back on the target
    if( $wrapper !== null ) {
        $target = $wrapper . '://' . $target;
    }

    // Safe mode fails with a trailing slash under certain PHP versions.
    $target = rtrim($target, '/'); // Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
    if ( empty($target) )
        $target = '/';

    if ( file_exists( $target ) )
        return @is_dir( $target );

    // We need to find the permissions of the parent folder that exists and inherit that.
    $target_parent = dirname( $target );
    while ( '.' != $target_parent && ! is_dir( $target_parent ) ) {
        $target_parent = dirname( $target_parent );
    }

    // Get the permission bits.
    if ( $stat = @stat( $target_parent ) ) {
        $dir_perms = $stat['mode'] & 0007777;
    } else {
        $dir_perms = 0777;
    }

    if ( @mkdir( $target, $dir_perms, true ) ) {

        // If a umask is set that modifies $dir_perms, we'll have to re-set the $dir_perms correctly with chmod()
        if ( $dir_perms != ( $dir_perms & ~umask() ) ) {
            $folder_parts = explode( '/', substr( $target, strlen( $target_parent ) + 1 ) );
            for ( $i = 1; $i <= count( $folder_parts ); $i++ ) {
                @chmod( $target_parent . '/' . implode( '/', array_slice( $folder_parts, 0, $i ) ), $dir_perms );
            }
        }

        return true;
    }

    return false;
}

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