Viewing github.com/alecthomas/chroma/lexers/embedded/php.xml

```
<lexer>
```
```
  <config>
```
```
    <name>PHP</name>
```
```
    <alias>php</alias>
```
```
    <alias>php3</alias>
```
```
    <alias>php4</alias>
```
```
    <alias>php5</alias>
```
```
    <filename>*.php</filename>
```
```
    <filename>*.php[345]</filename>
```
```
    <filename>*.inc</filename>
```
```
    <mime_type>text/x-php</mime_type>
```

    <case_insensitive>true</case_insensitive>

```
    <dot_all>true</dot_all>
```
```
    <ensure_nl>true</ensure_nl>
```
```
    <priority>3</priority>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="magicfuncs">
```

      <rule pattern="(__callStatic|__set_state|__construct|__debugInfo|__toString|__destruct|__invoke|__wakeup|__clone|__sleep|__isset|__unset|__call|__get|__set)\b">

        <token type="NameFunctionMagic"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="magicconstants">
```

      <rule pattern="(__NAMESPACE__|__FUNCTION__|__METHOD__|__CLASS__|__TRAIT__|__LINE__|__FILE__|__DIR__)\b">

```
        <token type="NameConstant"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="classname">
```

      <rule pattern="(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*">

```
        <token type="NameClass"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="functionname">
```
```
      <rule>
```
```
        <include state="magicfuncs"/>
```
```
      </rule>
```

      <rule pattern="(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*">

```
        <token type="NameFunction"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="string">
```
```
      <rule pattern="&#34;">
```

        <token type="LiteralStringDouble"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="[^{$&#34;\\]+">
```

        <token type="LiteralStringDouble"/>

```
      </rule>
```

      <rule pattern="\\([nrt&#34;$\\]|[0-7]{1,3}|x[0-9a-f]{1,2})">

        <token type="LiteralStringEscape"/>

```
      </rule>
```

      <rule pattern="\$(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*(\[\S+?\]|-&gt;(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)?">

        <token type="LiteralStringInterpol"/>

```
      </rule>
```

      <rule pattern="(\{\$\{)(.*?)(\}\})">

```
        <bygroups>
```

          <token type="LiteralStringInterpol"/>

```
          <usingself state="root"/>
```

          <token type="LiteralStringInterpol"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="(\{)(\$.*?)(\})">
```
```
        <bygroups>
```

          <token type="LiteralStringInterpol"/>

```
          <usingself state="root"/>
```

          <token type="LiteralStringInterpol"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="(\$\{)(\S+)(\})">
```
```
        <bygroups>
```

          <token type="LiteralStringInterpol"/>

```
          <token type="NameVariable"/>
```

          <token type="LiteralStringInterpol"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="[${\\]">
```

        <token type="LiteralStringDouble"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule pattern="\?&gt;">
```
```
        <token type="CommentPreproc"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

      <rule pattern="(&lt;&lt;&lt;)([\&#39;&#34;]?)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)(\2\n.*?\n\s*)(\3)(;?)(\n)">

```
        <bygroups>
```

          <token type="LiteralString"/>

          <token type="LiteralString"/>

          <token type="LiteralStringDelimiter"/>

          <token type="LiteralString"/>

          <token type="LiteralStringDelimiter"/>

```
          <token type="Punctuation"/>
```
```
          <token type="Text"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="#.*?\n">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
      <rule pattern="//.*?\n">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
      <rule pattern="/\*\*/">
```

        <token type="CommentMultiline"/>

```
      </rule>
```
```
      <rule pattern="/\*\*.*?\*/">
```

        <token type="LiteralStringDoc"/>

```
      </rule>
```
```
      <rule pattern="/\*.*?\*/">
```

        <token type="CommentMultiline"/>

```
      </rule>
```

      <rule pattern="(-&gt;|::)(\s*)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)">

```
        <bygroups>
```
```
          <token type="Operator"/>
```
```
          <token type="Text"/>
```

          <token type="NameAttribute"/>

```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="[~!%^&amp;*+=|:.&lt;&gt;/@-]+">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="\?">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[\[\]{}();,]+">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern="(class)(\s+)">
```
```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="classname"/>
```
```
      </rule>
```

      <rule pattern="(function)(\s*)(?=\()">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(function)(\s+)(&amp;?)(\s*)">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
          <token type="Operator"/>
```
```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="functionname"/>
```
```
      </rule>
```

      <rule pattern="(const)(\s+)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
          <token type="NameConstant"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(and|E_PARSE|old_function|E_ERROR|or|as|E_WARNING|parent|eval|PHP_OS|break|exit|case|extends|PHP_VERSION|cfunction|FALSE|print|for|require|continue|foreach|require_once|declare|return|default|static|do|switch|die|stdClass|echo|else|TRUE|elseif|var|empty|if|xor|enddeclare|include|virtual|endfor|include_once|while|endforeach|global|endif|list|endswitch|new|endwhile|not|array|E_ALL|NULL|final|php_user_filter|interface|implements|public|private|protected|abstract|clone|try|catch|throw|this|use|namespace|trait|yield|finally)\b">

```
        <token type="Keyword"/>
```
```
      </rule>
```

      <rule pattern="(true|false|null)\b">

        <token type="KeywordConstant"/>

```
      </rule>
```
```
      <rule>
```

        <include state="magicconstants"/>

```
      </rule>
```

      <rule pattern="\$\{\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*\}">

```
        <token type="NameVariable"/>
```
```
      </rule>
```

      <rule pattern="\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*">

```
        <token type="NameVariable"/>
```
```
      </rule>
```

      <rule pattern="(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*">

```
        <token type="NameOther"/>
```
```
      </rule>
```

      <rule pattern="(\d+\.\d*|\d*\.\d+)(e[+-]?[0-9]+)?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```
```
      <rule pattern="\d+e[+-]?[0-9]+">
```

        <token type="LiteralNumberFloat"/>

```
      </rule>
```
```
      <rule pattern="0[0-7]+">
```

        <token type="LiteralNumberOct"/>

```
      </rule>
```
```
      <rule pattern="0x[a-f0-9_]+">
```

        <token type="LiteralNumberHex"/>

```
      </rule>
```
```
      <rule pattern="\d[\d_]*">
```

        <token type="LiteralNumberInteger"/>

```
      </rule>
```
```
      <rule pattern="0b[01]+">
```

        <token type="LiteralNumberBin"/>

```
      </rule>
```

      <rule pattern="&#39;([^&#39;\\]*(?:\\.[^&#39;\\]*)*)&#39;">

        <token type="LiteralStringSingle"/>

```
      </rule>
```

      <rule pattern="`([^`\\]*(?:\\.[^`\\]*)*)`">

        <token type="LiteralStringBacktick"/>

```
      </rule>
```
```
      <rule pattern="&#34;">
```

        <token type="LiteralStringDouble"/>

```
        <push state="string"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```