[WordPress] Change the theme/plugin zip update folder to /tmp instead of /uploads .

functions.php

<?php

add_filter( 'upload_dir', function ( $dir ) {
    global $pagenow;
    if ( ! isset( $pagenow ) || 'update.php' !== $pagenow ) {
        return $dir;
    }
    if ( ! isset( $_REQUEST['action'] ) || 'upload-theme' !== $_REQUEST['action'] ) {
        return $dir;
    }
    if ( false === function_exists( 'is_user_logged_in' ) ) {
        return $dir;       
    }
    if ( false === is_user_logged_in() ) {
        return $dir;       
    }
    if ( false === current_user_can( 'upload_themes' ) ) {
        return $dir;       
    }
    if ( false === $_REQUEST[ '_wpnonce' ] ) {
        return $dir;       
    }
    if ( false === ( wp_verify_nonce( $_REQUEST[ '_wpnonce' ], 'theme-upload' ) ) ) {
        return $dir;
    }
    $dir['path'] = get_temp_dir();
    $dir['subdir'] = '';
    $dir['basedir'] = $dir['path'];
    return $dir;
} );

add_filter( 'upload_dir', function ( $dir ) {
    global $pagenow;
    if ( ! isset( $pagenow ) || 'update.php' !== $pagenow ) {
        return $dir;
    }
    if ( ! isset( $_REQUEST['action'] ) || 'upload-plugin' !== $_REQUEST['action'] ) {
        return $dir;
    }
    if ( false === function_exists( 'is_user_logged_in' ) ) {
        return $dir;       
    }
    if ( false === is_user_logged_in() ) {
        return $dir;       
    }
    if ( false === current_user_can( 'upload_plugins' ) ) {
        return $dir;       
    }
    if ( false === $_REQUEST[ '_wpnonce' ] ) {
        return $dir;       
    }
    if ( false === ( wp_verify_nonce( $_REQUEST[ '_wpnonce' ], 'plugin-upload' ) ) ) {
        return $dir;
    }
    $dir['path'] = get_temp_dir();
    $dir['subdir'] = '';
    $dir['basedir'] = $dir['path'];
    return $dir;
} );