highlight_string Syntax highlighting of a string mixedhighlight_string stringstr boolreturn The highlight_string function outputs a syntax highlighted version of str using the colors defined in the built-in syntax highlighter for PHP. If the second parameter return is set to &true; then highlight_string will return the highlighted code as a string instead of printing it out. If the second parameter is not set to &true; then highlight_string will return &true; on success, &false; on failure. The return parameter became available in PHP 4.2.0. Before this time it behaved like the default, which is &false; See also highlight_file, and show_source.