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PHP Function to Minify HTML, CSS and JavaScript
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| <?php | |
| // Based on <https://github.com/mecha-cms/extend.minify> | |
| // Downgraded to PHP 5.3.29 to backward compatibility | |
| define('MINIFY_STRING', '"(?:[^"\\\]|\\\.)*"|\'(?:[^\'\\\]|\\\.)*\''); | |
| define('MINIFY_COMMENT_CSS', '/\*[\s\S]*?\*/'); | |
| define('MINIFY_COMMENT_HTML', '<!\-{2}[\s\S]*?\-{2}>'); | |
| define('MINIFY_COMMENT_JS', '//[^\n]*'); | |
| define('MINIFY_PATTERN_JS', '/[^\n]+?/[gimuy]*'); | |
| define('MINIFY_HTML', '<[!/]?[a-zA-Z\d:.-]+[\s\S]*?>'); | |
| define('MINIFY_HTML_ENT', '&(?:[a-zA-Z\d]+|\#\d+|\#x[a-fA-F\d]+);'); | |
| define('MINIFY_HTML_KEEP', '<pre(?:\s[^<>]*?)?>[\s\S]*?</pre>|<code(?:\s[^<>]*?)?>[\s\S]*?</code>|<script(?:\s[^<>]*?)?>[\s\S]*?</script>|<style(?:\s[^<>]*?)?>[\s\S]*?</style>|<textarea(?:\s[^<>]*?)?>[\s\S]*?</textarea>'); | |
| // get URL | |
| $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] === 443 ? 'https' : 'http') . '://'; | |
| $host = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : (isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : ""); | |
| $url = $protocol . $host; | |
| // escape character | |
| define('X', "\x1A"); | |
| // normalize line–break(s) | |
| function n($s) { | |
| return str_replace(Array("\r\n", "\r"), "\n", $s); | |
| } | |
| // trim once | |
| function t($a, $b) { | |
| if ($a && strpos($a, $b) === 0 && substr($a, -strlen($b)) === $b) { | |
| return substr(substr($a, strlen($b)), 0, -strlen($b)); | |
| } | |
| return $a; | |
| } | |
| function fn_minify($pattern, $input) { | |
| return preg_split('#(' . implode('|', $pattern) . ')#', $input, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE); | |
| } | |
| function fn_minify_css($input, $comment = 2, $quote = 2) { | |
| if (!is_string($input) || !$input = n(trim($input))) return $input; | |
| $output = $prev = ""; | |
| foreach (fn_minify(Array(MINIFY_COMMENT_CSS, MINIFY_STRING), $input) as $part) { | |
| if (trim($part) === "") continue; | |
| if ($comment !== 1 && strpos($part, '/*') === 0 && substr($part, -2) === '*/') { | |
| if ( | |
| $comment === 2 && ( | |
| // Detect special comment(s) from the third character. It should be a `!` or `*` → `/*! keep */` or `/** keep */` | |
| strpos('*!', $part[2]) !== false || | |
| // Detect license comment(s) from the content. It should contains character(s) like `@license` | |
| stripos($part, '@licence') !== false || // noun | |
| stripos($part, '@license') !== false || // verb | |
| stripos($part, '@preserve') !== false | |
| ) | |
| ) { | |
| $output .= $part; | |
| } | |
| continue; | |
| } | |
| if ($part[0] === '"' && substr($part, -1) === '"' || $part[0] === "'" && substr($part, -1) === "'") { | |
| // Remove quote(s) where possible … | |
| $q = $part[0]; | |
| if ( | |
| $quote !== 1 && ( | |
| // <https://www.w3.org/TR/CSS2/syndata.html#uri> | |
| substr($prev, -4) === 'url(' && preg_match('#\burl\($#', $prev) || | |
| // <https://www.w3.org/TR/CSS2/syndata.html#characters> | |
| substr($prev, -1) === '=' && preg_match('#^' . $q . '[a-zA-Z_][\w-]*?' . $q . '$#', $part) | |
| ) | |
| ) { | |
| $part = t($part, $q); // trim quote(s) | |
| } | |
| $output .= $part; | |
| } else { | |
| $output .= fn_minify_css_union($part); | |
| } | |
| $prev = $part; | |
| } | |
| return trim($output); | |
| } | |
| function fn_minify_css_union($input) { | |
| if (stripos($input, 'calc(') !== false) { | |
| // Keep important white–space(s) in `calc()` | |
| $input = preg_replace_callback('#\b(calc\()\s*(.*?)\s*\)#i', function($m) { | |
| return $m[1] . preg_replace('#\s+#', X, $m[2]) . ')'; | |
| }, $input); | |
| } | |
| $input = preg_replace(Array( | |
| // Fix case for `#foo<space>[bar="baz"]`, `#foo<space>*` and `#foo<space>:first-child` [^1] | |
| '#(?<=[\w])\s+(\*|\[|:[\w-]+)#', | |
| // Fix case for `[bar="baz"]<space>.foo`, `*<space>.foo`, `:nth-child(2)<space>.foo` and `@media<space>(foo: bar)<space>and<space>(baz: qux)` [^2] | |
| '#([*\]\)])\s+(?=[\w\#.])#', '#\b\s+\(#', '#\)\s+\b#', | |
| // Minify HEX color code … [^3] | |
| '#\#([a-f\d])\1([a-f\d])\2([a-f\d])\3\b#i', | |
| // Remove white–space(s) around punctuation(s) [^4] | |
| '#\s*([~!@*\(\)+=\{\}\[\]:;,>\/])\s*#', | |
| // Replace zero unit(s) with `0` [^5] | |
| '#\b(?<!\d\.)(?:0+\.)?0+(?:[a-z]+\b)#i', | |
| // Replace `0.6` with `.6` [^6] | |
| '#\b0+\.(\d+)#', | |
| // Replace `:0 0`, `:0 0 0` and `:0 0 0 0` with `:0` [^7] | |
| '#:(0\s+){0,3}0(?=[!,;\)\}]|$)#', | |
| // Replace `background(?:-position)?:(0|none)` with `background$1:0 0` [^8] | |
| '#\b(background(?:-position)?):(?:0|none)([;,\}])#i', | |
| // Replace `(border(?:-radius)?|outline):none` with `$1:0` [^9] | |
| '#\b(border(?:-radius)?|outline):none\b#i', | |
| // Remove empty selector(s) [^10] | |
| '#(^|[\{\}])(?:[^\{\}]+)\{\}#', | |
| // Remove the last semi–colon and replace multiple semi–colon(s) with a semi–colon [^11] | |
| '#;+([;\}])#', | |
| // Replace multiple white–space(s) with a space [^12] | |
| '#\s+#' | |
| ), Array( | |
| // [^1] | |
| X . '$1', | |
| // [^2] | |
| '$1' . X, X . '(', ')' . X, | |
| // [^3] | |
| '#$1$2$3', | |
| // [^4] | |
| '$1', | |
| // [^5] | |
| '0', | |
| // [^6] | |
| '.$1', | |
| // [^7] | |
| ':0', | |
| // [^8] | |
| '$1:0 0$2', | |
| // [^9] | |
| '$1:0', | |
| // [^10] | |
| '$1', | |
| // [^11] | |
| '$1', | |
| // [^12] | |
| ' ' | |
| ), $input); | |
| return trim(str_replace(X, ' ', $input)); | |
| } | |
| function fn_minify_html($input, $comment = 2, $quote = 1) { | |
| if (!is_string($input) || !$input = n(trim($input))) return $input; | |
| $output = $prev = ""; | |
| foreach (fn_minify(Array(MINIFY_COMMENT_HTML, MINIFY_HTML_KEEP, MINIFY_HTML, MINIFY_HTML_ENT), $input) as $part) { | |
| if ($part === "\n") continue; | |
| if ($part !== ' ' && trim($part) === "" || $comment !== 1 && strpos($part, '<!--') === 0) { | |
| // Detect IE conditional comment(s) by its closing tag … | |
| if ($comment === 2 && substr($part, -12) === '<![endif]-->') { | |
| $output .= $part; | |
| } | |
| continue; | |
| } | |
| if ($part[0] === '<' && substr($part, -1) === '>') { | |
| $output .= fn_minify_html_union($part, $quote); | |
| } else if ($part[0] === '&' && substr($part, -1) === ';' && $part !== '<' && $part !== '>' && $part !== '&') { | |
| $output .= html_entity_decode($part); // Evaluate HTML entit(y|ies) | |
| } else { | |
| $output .= preg_replace('#\s+#', ' ', $part); | |
| } | |
| $prev = $part; | |
| } | |
| $output = str_replace(' </', '</', $output); | |
| // Force space with ` ` and line–break with `
` | |
| return str_ireplace(Array(' ', ' ', '
', '
'), Array(' ', ' ', "\n", "\n"), trim($output)); | |
| } | |
| function fn_minify_html_union($input, $quote) { | |
| if ( | |
| strpos($input, ' ') === false && | |
| strpos($input, "\n") === false && | |
| strpos($input, "\t") === false | |
| ) return $input; | |
| global $url; | |
| return preg_replace_callback('#<\s*([^\/\s]+)\s*(?:>|(\s[^<>]+?)\s*>)#', function($m) use($quote, $url) { | |
| if (isset($m[2])) { | |
| // Minify inline CSS(s) | |
| if (stripos($m[2], ' style=') !== false) { | |
| $m[2] = preg_replace_callback('#( style=)([\'"]?)(.*?)\2#i', function($m) { | |
| return $m[1] . $m[2] . fn_minify_css($m[3]) . $m[2]; | |
| }, $m[2]); | |
| } | |
| // Minify URL(s) | |
| if (strpos($m[2], '://') !== false) { | |
| $m[2] = str_replace(Array( | |
| $url . '/', | |
| $url . '?', | |
| $url . '&', | |
| $url . '#', | |
| $url . '"', | |
| $url . "'" | |
| ), Array( | |
| '/', | |
| '?', | |
| '&', | |
| '#', | |
| '/"', | |
| "/'" | |
| ), $m[2]); | |
| } | |
| $a = 'a(sync|uto(focus|play))|c(hecked|ontrols)|d(efer|isabled)|hidden|ismap|loop|multiple|open|re(adonly|quired)|s((cop|elect)ed|pellcheck)'; | |
| $a = '<' . $m[1] . preg_replace(Array( | |
| // From `a="a"`, `a='a'`, `a="true"`, `a='true'`, `a=""` and `a=''` to `a` [^1] | |
| '#\s(' . $a . ')(?:=([\'"]?)(?:true|\1)?\2)#i', | |
| // Remove extra white–space(s) between HTML attribute(s) [^2] | |
| '#\s*([^\s=]+?)(=(?:\S+|([\'"]?).*?\3)|$)#', | |
| // From `<img />` to `<img/>` [^3] | |
| '#\s+\/$#' | |
| ), Array( | |
| // [^1] | |
| ' $1', | |
| // [^2] | |
| ' $1$2', | |
| // [^3] | |
| '/' | |
| ), str_replace("\n", ' ', $m[2])) . '>'; | |
| return $quote !== 1 ? fn_minify_html_union_attr($a) : $a; | |
| } | |
| return '<' . $m[1] . '>'; | |
| }, $input); | |
| } | |
| function fn_minify_html_union_attr($input) { | |
| if (strpos($input, '=') === false) return $input; | |
| return preg_replace_callback('#=(' . MINIFY_STRING . ')#', function($m) { | |
| $q = $m[1][0]; | |
| if (strpos($m[1], ' ') === false && preg_match('#^' . $q . '[a-zA-Z_][\w-]*?' . $q . '$#', $m[1])) { | |
| return '=' . t($m[1], $q); | |
| } | |
| return $m[0]; | |
| }, $input); | |
| } | |
| function fn_minify_js($input, $comment = 2, $quote = 2) { | |
| if (!is_string($input) || !$input = n(trim($input))) return $input; | |
| $output = $prev = ""; | |
| foreach (fn_minify(Array(MINIFY_COMMENT_CSS, MINIFY_STRING, MINIFY_COMMENT_JS, MINIFY_PATTERN_JS), $input) as $part) { | |
| if (trim($part) === "") continue; | |
| if ($comment !== 1 && ( | |
| strpos($part, '//') === 0 || // Remove inline comment(s) | |
| strpos($part, '/*') === 0 && substr($part, -2) === '*/' | |
| )) { | |
| if ( | |
| $comment === 2 && ( | |
| // Detect special comment(s) from the third character. It should be a `!` or `*` → `/*! keep */` or `/** keep */` | |
| strpos('*!', $part[2]) !== false || | |
| // Detect license comment(s) from the content. It should contains character(s) like `@license` | |
| stripos($part, '@licence') !== false || // noun | |
| stripos($part, '@license') !== false || // verb | |
| stripos($part, '@preserve') !== false | |
| ) | |
| ) { | |
| $output .= $part; | |
| } | |
| continue; | |
| } | |
| if ($part[0] === '/' && (substr($part, -1) === '/' || preg_match('#\/[gimuy]*$#', $part))) { | |
| $output .= $part; | |
| } else if ($part[0] === '"' && substr($part, -1) === '"' || $part[0] === "'" && substr($part, -1) === "'") { | |
| // TODO: Remove quote(s) where possible … | |
| $output .= $part; | |
| } else { | |
| $output .= fn_minify_js_union($part); | |
| } | |
| $prev = $part; | |
| } | |
| return $output; | |
| } | |
| function fn_minify_js_union($input) { | |
| return preg_replace(Array( | |
| // Remove white–space(s) around punctuation(s) [^1] | |
| '#\s*([!%&*\(\)\-=+\[\]\{\}|;:,.<>?\/])\s*#', | |
| // Remove the last semi–colon and comma [^2] | |
| '#[;,]([\]\}])#', | |
| // Replace `true` with `!0` and `false` with `!1` [^3] | |
| '#\btrue\b#', '#\bfalse\b#', '#\b(return\s?)\s*\b#', | |
| // Replace `new Array(x)` with `[x]` … [^4] | |
| '#\b(?:new\s+)?Array\((.*?)\)#', '#\b(?:new\s+)?Object\((.*?)\)#' | |
| ), Array( | |
| // [^1] | |
| '$1', | |
| // [^2] | |
| '$1', | |
| // [^3] | |
| '!0', '!1', '$1', | |
| // [^4] | |
| '[$1]', '{$1}' | |
| ), $input); | |
| } | |
| /** | |
| * Backward Compatibility | |
| * ---------------------- | |
| */ | |
| function minify_css($lot) { | |
| return fn_minify_css($lot); | |
| } | |
| function minify_html($lot) { | |
| return fn_minify_html($lot); | |
| } | |
| function minify_js($lot) { | |
| return fn_minify_js($lot); | |
| } | |
| ?> |
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