/usr/share/gtksourceview-3.0/language-specs/php.lang is in libgtksourceview-3.0-common 3.18.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
This file is part of GtkSourceView
Author: Francesco Gigli <jaramir@aruba.it>
Copyright (C) 2003 Francesco Gigli <jaramir@aruba.it>
Copyright (C) 2004 David A Knight <david@ritter.demon.co.uk>
Copyright (C) 2006 Steve Frécinaux <steve@istique.net>
Copyright (C) 2007 Patryk Zawadzki <patrys@pld-linux.org>
Copyright (C) 2007 Eric Norige <thelema@swbell.net>
Copyright (C) 2012 Christopher Blay <chris.b.blay@gmail.com>
GtkSourceView is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
GtkSourceView is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-->
<language id="php" _name="PHP" version="2.0" _section="Script">
<metadata>
<property name="mimetypes">text/x-php;application/x-php;text/x-php-source;application/x-php-source</property>
<property name="globs">*.php;*.php3;*.php4;*.phtml</property>
<property name="line-comment-start">#</property>
<property name="block-comment-start">/*</property>
<property name="block-comment-end">*/</property>
</metadata>
<styles>
<style id="preprocessor" _name="Preprocessor tags" map-to="def:preprocessor"/>
<style id="comment" _name="Comment" map-to="def:comment"/>
<style id="error" _name="Error" map-to="def:error"/>
<style id="variable" _name="Variable" map-to="def:identifier"/>
<style id="identifier" _name="Identifier"/> <!-- map to nothing -->
<style id="escape" _name="Escaped Character" map-to="def:special-char"/>
<style id="string" _name="String" map-to="def:string"/>
<style id="here-doc" _name="Heredoc" map-to="def:string"/>
<style id="here-doc-bound" _name="Heredoc Bound" map-to="def:keyword"/>
<style id="keyword" _name="Keyword" map-to="def:keyword"/>
<style id="common-function" _name="Common Function" map-to="def:keyword"/>
<style id="operator" _name="Operator" map-to="def:operator"/>
<style id="type" _name="Data Type" map-to="def:type"/>
<style id="null-value" _name="Null Value" map-to="def:special-constant"/>
<style id="boolean" _name="Boolean value" map-to="def:boolean"/>
<style id="floating-point" _name="Floating point number" map-to="def:floating-point"/>
<style id="decimal" _name="Decimal number" map-to="def:decimal"/>
<style id="octal" _name="Octal number" map-to="def:base-n-integer"/>
<style id="hexadecimal" _name="Hexadecimal number" map-to="def:base-n-integer"/>
</styles>
<definitions>
<context id="bash-line-comment" style-ref="comment" end-at-line-end="true" extend-parent="false" class="comment" class-disabled="no-spell-check">
<start>#</start>
<include>
<context ref="def:in-line-comment"/>
</include>
</context>
<context id="cpp-line-comment" style-ref="comment" end-at-line-end="true" extend-parent="false" class="comment" class-disabled="no-spell-check">
<start>//</start>
<include>
<context ref="def:in-line-comment"/>
</include>
</context>
<context id="c-block-comment" style-ref="comment" class="comment" class-disabled="no-spell-check">
<start>/\*</start>
<end>\*/</end>
<include>
<context ref="def:in-line-comment"/>
</include>
</context>
<context id="close-comment-outside-comment" style-ref="error">
<match>\*/(?!\*)</match>
</context>
<context id="escape" style-ref="escape">
<match>\\((\\|"|n|t|\$|r)|[0-7]{1,3}|x[0-9a-fA-F]{1,2})</match>
</context>
<context id="variable" style-ref="variable">
<match>[$]+[a-zA-Z_][a-zA-Z0-9_]*</match>
</context>
<context id="array-operators" style-ref="variable">
<match>(\[|\])</match>
</context>
<context id="string-var">
<include>
<context ref="variable"/>
<context id="curly-var" style-ref="variable" >
<start>{(?=\$)</start>
<end>}</end>
<include>
<context ref="string-var"/>
</include>
</context>
<context id="backwards-curly-var" style-ref="variable">
<start>\${</start>
<end>}</end>
<include>
<context ref="string-var"/>
</include>
</context>
</include>
</context>
<context id="double-quoted-string" style-ref="string" class="string" class-disabled="no-spell-check">
<start>"</start>
<end>"</end>
<include>
<context ref="escape"/>
<context ref="string-var"/>
<context ref="def:line-continue"/>
</include>
</context>
<context id="single-quoted-string" style-ref="string" class="string" class-disabled="no-spell-check">
<start>'</start>
<end>'</end>
<include>
<context style-ref="def:special-char">
<match>\\['\\]</match>
</context>
<context ref="def:line-continue"/>
</include>
</context>
<context id="backtick-string" style-ref="string" extend-parent="false">
<start>`</start>
<end>`</end>
<include>
<context ref="escape"/>
<context ref="def:line-continue"/>
</include>
</context>
<context id="here-doc-string" style-ref="here-doc" extend-parent="true">
<start>(<<<)\s?([a-zA-Z_][a-zA-Z0-9_]*)</start>
<end>^(\%{2@start});?$</end>
<include>
<context sub-pattern="0" where="start" style-ref="here-doc-bound"/>
<context sub-pattern="1" where="end" style-ref="here-doc-bound"/>
<context ref="escape"/>
<context ref="string-var"/>
<context ref="def:line-continue"/>
</include>
</context>
<context id="now-doc-string" style-ref="here-doc" extend-parent="true">
<start>(<<<)\s?'([a-zA-Z_][a-zA-Z0-9_]*)'</start>
<end>^(\%{2@start});?$</end>
<include>
<context sub-pattern="0" where="start" style-ref="here-doc-bound"/>
<context sub-pattern="1" where="end" style-ref="here-doc-bound"/>
<context style-ref="def:special-char">
<match>\\['\\]</match>
</context>
<context ref="def:line-continue"/>
</include>
</context>
<context id="identifier" style-ref="identifier">
<match>[a-zA-Z_][a-zA-Z0-9_]*</match>
</context>
<context id="keywords" style-ref="keyword">
<keyword>abstract</keyword>
<keyword>and</keyword>
<keyword>as</keyword>
<keyword>break</keyword>
<keyword>case</keyword>
<keyword>catch</keyword>
<keyword>class</keyword>
<keyword>clone</keyword>
<keyword>const</keyword>
<keyword>continue</keyword>
<keyword>declare</keyword>
<keyword>default</keyword>
<keyword>die</keyword>
<keyword>do</keyword>
<keyword>echo</keyword>
<keyword>else</keyword>
<keyword>elseif</keyword>
<keyword>empty</keyword>
<keyword>enddeclare</keyword>
<keyword>endfor</keyword>
<keyword>endforeach</keyword>
<keyword>endif</keyword>
<keyword>endswitch</keyword>
<keyword>endwhile</keyword>
<keyword>eval</keyword>
<keyword>exit</keyword>
<keyword>extends</keyword>
<keyword>final</keyword>
<keyword>finally</keyword>
<keyword>for</keyword>
<keyword>foreach</keyword>
<keyword>function</keyword>
<keyword>global</keyword>
<keyword>goto</keyword>
<keyword>if</keyword>
<keyword>implements</keyword>
<keyword>include</keyword>
<keyword>include_once</keyword>
<keyword>instanceof</keyword>
<keyword>insteadof</keyword>
<keyword>interface</keyword>
<keyword>isset</keyword>
<keyword>list</keyword>
<keyword>namespace</keyword>
<keyword>new</keyword>
<keyword>or</keyword>
<keyword>print</keyword>
<keyword>private</keyword>
<keyword>protected</keyword>
<keyword>public</keyword>
<keyword>require</keyword>
<keyword>require_once</keyword>
<keyword>return</keyword>
<keyword>static</keyword>
<keyword>switch</keyword>
<keyword>throw</keyword>
<keyword>trait</keyword>
<keyword>try</keyword>
<keyword>unset</keyword>
<keyword>use</keyword>
<keyword>var</keyword>
<keyword>while</keyword>
<keyword>xor</keyword>
<keyword>yield</keyword>
</context>
<context id="common-function" style-ref="keyword">
<keyword>doubleval</keyword>
<keyword>floatval</keyword>
<keyword>gettype</keyword>
<keyword>intval</keyword>
<keyword>print_r</keyword>
<keyword>serialize</keyword>
<keyword>settype</keyword>
<keyword>strval</keyword>
<keyword>unserialize</keyword>
<keyword>var_dump</keyword>
<keyword>var_export</keyword>
</context>
<context id="operators" style-ref="operator" extend-parent="false">
<match>[-.~^@,;:/%|\=\+\*\!\?&<>()]</match>
</context>
<context id="type" style-ref="type">
<keyword>array</keyword>
<keyword>bool</keyword>
<keyword>boolean</keyword>
<keyword>callable</keyword>
<keyword>double</keyword>
<keyword>float</keyword>
<keyword>int</keyword>
<keyword>integer</keyword>
<keyword>numeric</keyword>
<keyword>object</keyword>
<keyword>resource</keyword>
<keyword>string</keyword>
<keyword>unset</keyword>
</context>
<context id="null-value" style-ref="null-value">
<prefix>(?i)\b</prefix> <!-- case insensitive -->
<keyword>null</keyword>
</context>
<context id="boolean" style-ref="boolean">
<prefix>(?i)\b</prefix> <!-- case insensitive -->
<keyword>false</keyword>
<keyword>true</keyword>
</context>
<context id="float" style-ref="floating-point">
<match extended="true">
(?<![\w\.])
([0-9]+[Ee][+-]?[0-9]+ |
([0-9]*\.[0-9]+ | [0-9]+\.[0-9]*)([Ee][+-]?[0-9]+)?)
(?![\w\.])
</match>
</context>
<context id="decimal-number" style-ref="decimal">
<match extended="true">
(?<![\w\.])
[+-]?([1-9][0-9]*|0)
(?![\w\.])
</match>
</context>
<context id="octal-number" style-ref="octal">
<match extended="true">
(?<![\w\.])
[+-]?0[0-7]+
(?![\w\.])
</match>
</context>
<context id="hexadecimal-number" style-ref="hexadecimal">
<match extended="true">
(?<![\w\.])
[+-]?0x[0-9a-fA-F]+
(?![\w\.])
</match>
</context>
<context id="php-block">
<start><([?](php)?)</start>
<end>[?]></end>
<include>
<context sub-pattern="0" where="start" style-ref="preprocessor"/>
<context sub-pattern="0" where="end" style-ref="preprocessor"/>
<context ref="cpp-line-comment"/>
<context ref="bash-line-comment"/>
<context ref="c-block-comment"/>
<context ref="double-quoted-string"/>
<context ref="single-quoted-string"/>
<context ref="backtick-string"/>
<context ref="here-doc-string"/>
<context ref="now-doc-string"/>
<context ref="variable"/>
<context ref="array-operators"/>
<context ref="keywords"/>
<context ref="operators"/>
<context ref="type"/>
<context ref="null-value"/>
<context ref="boolean"/>
<context ref="float"/>
<context ref="decimal-number"/>
<context ref="octal-number"/>
<context ref="hexadecimal-number"/>
<context ref="identifier"/>
</include>
</context>
<replace id="html:embedded-lang-hook" ref="php-block"/>
<context id="php" class="no-spell-check">
<include>
<context ref="php-block"/>
<context ref="html:html"/>
</include>
</context>
</definitions>
</language>
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