This is a extended list of most used PHP helpers. For a complete list of helpers and utility functions please browse creatus/inc/helpers.php and creatus/inc/utility.php files.
Beside Creatus PHP helpers here is a list of Unyson PHP Helpers that you can use.

Get option

Return theme option value. If theme option is set in post/taxonomy custom option, it returns post/taxonomy custom option value instead.

thz_get_option( $option_id, $default_value = null );

Get theme option

Return only theme option value.

thz_get_theme_option( $option_id, $default_value = null );

Get post option

Return post or tax option value.

thz_get_post_option( $option_id = null, $default_value = null );

Get global option

Return portfolio, category, post or page option

_thz_fw_get_global_option ( $option_id, $default_value = null );

WP file system

Return wp_filesystem, initiate if not available.

thz_wp_file_system()

Theme uri

Return theme url. If child-theme is active return child-theme url.

thz_theme_uri()

Theme dir

Return theme dir. If child-theme is active return child-theme dir.

thz_theme_dir();

Theme file url

Return theme file uri. If file exists in child-theme return child-theme file uri.

/**
 * Search relative path in child than in parent theme directory and return URI
 * @param  string $rel_path '/some/path_to_dir' or '/some/path_to_file.php'
 * @return string URI
 */
thz_theme_file_uri( $rel_path );

Theme file path

Return theme file path. If file exists in child-theme return child-theme file path.

/**
 * Search relative path in child then in parent theme directory and return full path
 * @param  string $rel_path '/some/path_to_dir' or '/some/path_to_file.php'
 * @return string path
 */
thz_theme_file_path( $rel_path )

Theme version

Return current theme version.

thz_theme_version()

Sanitize class names

Retur sanitized HTML element class names.

thz_sanitize_class( $classnames, $fallback = null )

Property unit

Returns clean number with specified unit. If no match, fallback is used as unit.
Allowed units are px, %, rem, em, vw, vh, vmin ,vmax.
If $auto is set to true it allows auto as value if found. If $none is set to true it allows none as value if found.

thz_property_unit( $val, $default, $auto = false, $none = false )

Replace palette colors

Creatus color options can use palette codes like color_1 in output. Use this function to convert the color palette strings with actual color value. The function is able to convert multiple color codes and large strings like complete CSS files.

thz_replace_palette_colors( $string, $palette = false)