kmx.io/prism.js

diff --git a/components/prism-php.js b/components/prism-php.js
index 36899f1..dc89d56 100644
--- a/components/prism-php.js
+++ b/components/prism-php.js
@@ -13,7 +13,7 @@
 (function (Prism) {
 	Prism.languages.php = Prism.languages.extend('clike', {
 		'keyword': /\b(?:and|or|xor|array|as|break|case|cfunction|class|const|continue|declare|default|die|do|else|elseif|enddeclare|endfor|endforeach|endif|endswitch|endwhile|extends|for|foreach|function|include|include_once|global|if|new|return|static|switch|use|require|require_once|var|while|abstract|interface|public|implements|private|protected|parent|throw|null|echo|print|trait|namespace|final|yield|goto|instanceof|finally|try|catch)\b/i,
-		'constant': /\b[A-Z0-9_]{2,}\b/,
+		'constant': /\b[A-Z_][A-Z0-9_]*\b/,
 		'comment': {
 			pattern: /(^|[^\\])(?:\/\*[\s\S]*?\*\/|\/\/.*)/,
 			lookbehind: true
diff --git a/components/prism-php.min.js b/components/prism-php.min.js
index 03260d4..373c168 100644
--- a/components/prism-php.min.js
+++ b/components/prism-php.min.js
@@ -1 +1 @@
-!function(e){e.languages.php=e.languages.extend("clike",{keyword:/\b(?:and|or|xor|array|as|break|case|cfunction|class|const|continue|declare|default|die|do|else|elseif|enddeclare|endfor|endforeach|endif|endswitch|endwhile|extends|for|foreach|function|include|include_once|global|if|new|return|static|switch|use|require|require_once|var|while|abstract|interface|public|implements|private|protected|parent|throw|null|echo|print|trait|namespace|final|yield|goto|instanceof|finally|try|catch)\b/i,constant:/\b[A-Z0-9_]{2,}\b/,comment:{pattern:/(^|[^\\])(?:\/\*[\s\S]*?\*\/|\/\/.*)/,lookbehind:!0}}),e.languages.insertBefore("php","string",{"shell-comment":{pattern:/(^|[^\\])#.*/,lookbehind:!0,alias:"comment"}}),e.languages.insertBefore("php","keyword",{delimiter:{pattern:/\?>|<\?(?:php|=)?/i,alias:"important"},variable:/\$+(?:\w+\b|(?={))/i,"package":{pattern:/(\\|namespace\s+|use\s+)[\w\\]+/,lookbehind:!0,inside:{punctuation:/\\/}}}),e.languages.insertBefore("php","operator",{property:{pattern:/(->)[\w]+/,lookbehind:!0}});var n={pattern:/{\$(?:{(?:{[^{}]+}|[^{}]+)}|[^{}])+}|(^|[^\\{])\$+(?:\w+(?:\[.+?]|->\w+)*)/,lookbehind:!0,inside:{rest:e.languages.php}};e.languages.insertBefore("php","string",{"nowdoc-string":{pattern:/<<<'([^']+)'(?:\r\n?|\n)(?:.*(?:\r\n?|\n))*?\1;/,greedy:!0,alias:"string",inside:{delimiter:{pattern:/^<<<'[^']+'|[a-z_]\w*;$/i,alias:"symbol",inside:{punctuation:/^<<<'?|[';]$/}}}},"heredoc-string":{pattern:/<<<(?:"([^"]+)"(?:\r\n?|\n)(?:.*(?:\r\n?|\n))*?\1;|([a-z_]\w*)(?:\r\n?|\n)(?:.*(?:\r\n?|\n))*?\2;)/i,greedy:!0,alias:"string",inside:{delimiter:{pattern:/^<<<(?:"[^"]+"|[a-z_]\w*)|[a-z_]\w*;$/i,alias:"symbol",inside:{punctuation:/^<<<"?|[";]$/}},interpolation:n}},"single-quoted-string":{pattern:/'(?:\\[\s\S]|[^\\'])*'/,greedy:!0,alias:"string"},"double-quoted-string":{pattern:/"(?:\\[\s\S]|[^\\"])*"/,greedy:!0,alias:"string",inside:{interpolation:n}}}),delete e.languages.php.string,e.hooks.add("before-tokenize",function(n){if(/(?:<\?php|<\?)/gi.test(n.code)){var t=/(?:<\?php|<\?)[\s\S]*?(?:\?>|$)/gi;e.languages["markup-templating"].buildPlaceholders(n,"php",t)}}),e.hooks.add("after-tokenize",function(n){e.languages["markup-templating"].tokenizePlaceholders(n,"php")})}(Prism);
\ No newline at end of file
+!function(e){e.languages.php=e.languages.extend("clike",{keyword:/\b(?:and|or|xor|array|as|break|case|cfunction|class|const|continue|declare|default|die|do|else|elseif|enddeclare|endfor|endforeach|endif|endswitch|endwhile|extends|for|foreach|function|include|include_once|global|if|new|return|static|switch|use|require|require_once|var|while|abstract|interface|public|implements|private|protected|parent|throw|null|echo|print|trait|namespace|final|yield|goto|instanceof|finally|try|catch)\b/i,constant:/\b[A-Z_][A-Z0-9_]*\b/,comment:{pattern:/(^|[^\\])(?:\/\*[\s\S]*?\*\/|\/\/.*)/,lookbehind:!0}}),e.languages.insertBefore("php","string",{"shell-comment":{pattern:/(^|[^\\])#.*/,lookbehind:!0,alias:"comment"}}),e.languages.insertBefore("php","keyword",{delimiter:{pattern:/\?>|<\?(?:php|=)?/i,alias:"important"},variable:/\$+(?:\w+\b|(?={))/i,"package":{pattern:/(\\|namespace\s+|use\s+)[\w\\]+/,lookbehind:!0,inside:{punctuation:/\\/}}}),e.languages.insertBefore("php","operator",{property:{pattern:/(->)[\w]+/,lookbehind:!0}});var n={pattern:/{\$(?:{(?:{[^{}]+}|[^{}]+)}|[^{}])+}|(^|[^\\{])\$+(?:\w+(?:\[.+?]|->\w+)*)/,lookbehind:!0,inside:{rest:e.languages.php}};e.languages.insertBefore("php","string",{"nowdoc-string":{pattern:/<<<'([^']+)'(?:\r\n?|\n)(?:.*(?:\r\n?|\n))*?\1;/,greedy:!0,alias:"string",inside:{delimiter:{pattern:/^<<<'[^']+'|[a-z_]\w*;$/i,alias:"symbol",inside:{punctuation:/^<<<'?|[';]$/}}}},"heredoc-string":{pattern:/<<<(?:"([^"]+)"(?:\r\n?|\n)(?:.*(?:\r\n?|\n))*?\1;|([a-z_]\w*)(?:\r\n?|\n)(?:.*(?:\r\n?|\n))*?\2;)/i,greedy:!0,alias:"string",inside:{delimiter:{pattern:/^<<<(?:"[^"]+"|[a-z_]\w*)|[a-z_]\w*;$/i,alias:"symbol",inside:{punctuation:/^<<<"?|[";]$/}},interpolation:n}},"single-quoted-string":{pattern:/'(?:\\[\s\S]|[^\\'])*'/,greedy:!0,alias:"string"},"double-quoted-string":{pattern:/"(?:\\[\s\S]|[^\\"])*"/,greedy:!0,alias:"string",inside:{interpolation:n}}}),delete e.languages.php.string,e.hooks.add("before-tokenize",function(n){if(/(?:<\?php|<\?)/gi.test(n.code)){var t=/(?:<\?php|<\?)[\s\S]*?(?:\?>|$)/gi;e.languages["markup-templating"].buildPlaceholders(n,"php",t)}}),e.hooks.add("after-tokenize",function(n){e.languages["markup-templating"].tokenizePlaceholders(n,"php")})}(Prism);
\ No newline at end of file
diff --git a/tests/languages/php/constant_feature.test b/tests/languages/php/constant_feature.test
index c1c5330..0002dfd 100644
--- a/tests/languages/php/constant_feature.test
+++ b/tests/languages/php/constant_feature.test
@@ -1,3 +1,5 @@
+_
+X
 AZ
 PRISM
 FOOBAR_42
@@ -5,6 +7,8 @@ FOOBAR_42
 ----------------------------------------------------
 
 [
+	["constant", "_"],
+	["constant", "X"],
 	["constant", "AZ"],
 	["constant", "PRISM"],
 	["constant", "FOOBAR_42"]