Php implements simple syntax highlighting function instance analysis

Php implements simple syntax highlighting function instance analysis

This article mainly introduces php to implement simple syntax highlighting functions. The example analyzes php's skills related to syntax highlighting through regular expressions. For more information, see

This example describes how php implements simple syntax highlighting functions. 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.

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Function syntax_highlight ($ code ){ // This matches --> "foobar" <-- $ Code = preg_replace ( '/"(.*?) "/U ', '"<Span style =" color: #007F00 "> $1 </span>"', $ code ); // Hightlight functions and other structures like --> function foobar () <--- $ Code = preg_replace ( '/(\ S) \ B (.*?) (\ B | \ s) \ ()/U ', '$1 <span style = "color: # 0000ff"> $2 </span> $3 ', $ Code ); // Match comments (like /**/): $ Code = preg_replace ( '/(\/) (. +) \ S /', '<Span style = "color: #660066; background-color: # FFFCB1;"> <I> $0 </I> </span> ', $ Code ); $ Code = preg_replace ( '/(\/\*.*? \ * \/)/S ', '<Span style = "color: #660066; background-color: # FFFCB1;"> <I> $0 </I> </span> ', $ Code ); // Hightlight braces: $ Code = preg_replace ('/(\ (| \ [|\{|\}|\] |\) | \-> )/', '<strong> $1 </strong>', $ code ); // Hightlight variables $ foobar $ Code = preg_replace ( '/(\ $[A-zA-Z0-9 _] +)/', '<span style = "color: #20.b3"> $1 </span>', $ 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 /', '<Span style = "color: # 7F007F"> $1 </span>', $ 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 '<pre> '; Print syntax_highlight ($ example_php_code ); Print '</pre> '; /* Example-end */

I hope this article will help you with php programming.