php.js

module.exports = function(hljs) {
  var VARIABLE = {
    className: 'variable', begin: '\\$+[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'
  };
  var STRINGS = [
    hljs.inherit(hljs.APOS_STRING_MODE, {illegal: null}),
    hljs.inherit(hljs.QUOTE_STRING_MODE, {illegal: null}),
    {
      className: 'string',
      begin: 'b"', end: '"',
      contains: [hljs.BACKSLASH_ESCAPE]
    },
    {
      className: 'string',
      begin: 'b\'', end: '\'',
      contains: [hljs.BACKSLASH_ESCAPE]
    }
  ];
  var NUMBERS = [hljs.BINARY_NUMBER_MODE, hljs.C_NUMBER_MODE];
  var TITLE = {
    className: 'title', begin: hljs.UNDERSCORE_IDENT_RE
  };
  return {
    case_insensitive: true,
    keywords:
      'and include_once list abstract global private echo interface as static endswitch ' +
      'array null if endwhile or const for endforeach self var while isset public ' +
      'protected exit foreach throw elseif include __FILE__ empty require_once do xor ' +
      'return implements parent clone use __CLASS__ __LINE__ else break print eval new ' +
      'catch __METHOD__ case exception php_user_filter default die require __FUNCTION__ ' +
      'enddeclare final try this switch continue endfor endif declare unset true false ' +
      'namespace trait goto instanceof insteadof __DIR__ __NAMESPACE__ __halt_compiler',
    contains: [
      hljs.C_LINE_COMMENT_MODE,
      hljs.HASH_COMMENT_MODE,
      {
        className: 'comment',
        begin: '/\\*', end: '\\*/',
        contains: [{
            className: 'phpdoc',
            begin: '\\s@[A-Za-z]+'
        }]
      },
      {
          className: 'comment',
          excludeBegin: true,
          begin: '__halt_compiler.+?;', endsWithParent: true
      },
      {
        className: 'string',
        begin: '<<<[\'"]?\\w+[\'"]?$', end: '^\\w+;',
        contains: [hljs.BACKSLASH_ESCAPE]
      },
      {
        className: 'preprocessor',
        begin: '<\\?php',
        relevance: 10
      },
      {
        className: 'preprocessor',
        begin: '\\?>'
      },
      VARIABLE,
      {
        className: 'function',
        beginWithKeyword: true, end: '{',
        keywords: 'function',
        illegal: '\\$|\\[|%',
        contains: [
          TITLE,
          {
            className: 'params',
            begin: '\\(', end: '\\)',
            contains: [
              'self',
              VARIABLE,
              hljs.C_BLOCK_COMMENT_MODE
            ].concat(STRINGS).concat(NUMBERS)
          }
        ]
      },
      {
        className: 'class',
        beginWithKeyword: true, end: '{',
        keywords: 'class',
        illegal: '[:\\(\\$]',
        contains: [
          {
            beginWithKeyword: true, endsWithParent: true,
            keywords: 'extends',
            contains: [TITLE]
          },
          TITLE
        ]
      },
      {
        begin: '=>' // No markup, just a relevance booster
      }
    ].concat(STRINGS).concat(NUMBERS)
  };
};