Php implements simple syntax highlighting function instance analysis

This article mainly introduces php's implementation of simple syntax highlighting functions. The example analyzes php's skills related to syntax highlighting through regular expressions, for more information about php syntax highlighting, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

This is a simple syntax highlighted function implemented by php. note: This function is easy to design and may not be highlighted for some syntaxes. you can expand the function by yourself.

function syntax_highlight($code){ // this matches --> "foobar" <-- $code = preg_replace(  '/"(.*?)"/U',   '"$1"', $code ); // hightlight functions and other structures like --> function foobar() <---  $code = preg_replace(  '/(\s)\b(.*?)((\b|\s)\()/U',   '$1$2$3',   $code ); // Match comments (like /* */):  $code = preg_replace(  '/(\/\/)(.+)\s/',   '$0',   $code ); $code = preg_replace(  '/(\/\*.*?\*\/)/s',   '$0',   $code ); // hightlight braces: $code = preg_replace('/(\(|\[|\{|\}|\]|\)|\->)/', '$1', $code); // hightlight variables $foobar $code = preg_replace(  '/(\$[a-zA-Z0-9_]+)/', '$1', $code ); /* The \b in the pattern indicates a word boundary, so only the distinct ** word "web" is matched, and not a word partial like "webbing" or "cobweb"  */ // special words and functions $code = preg_replace(  '/\b(print|echo|new|function)\b/',   '$1', $code ); return $code;}/*example-start*//*** Create some example PHP code:*/$example_php_code = '// some code comment:$example = "foobar";print $_SERVER["REMOTE_ADDR"];$array = array(1, 2, 3, 4, 5);function example_function($str) { // reverse string echo strrev($obj);}print example_function("foo");/*** A multiple line comment*/print "Something: " . $example;';// output the formatted code:print '
';print syntax_highlight($example_php_code);print '
';/*example-end*/

I hope this article will help you with php programming.