本文实例讲述了php实现压缩多个CSS与JS文件的方法。分享给大家供大家参考。具体实现方法如下：
1. 压缩css
复制代码 代码如下:
header('Content-type: text/css');
ob_start("compress");
function compress($buffer) {
$buffer = preg_replace('!!', '', $buffer);
$buffer = str_replace(array("rn", "r", "n", "t", ' ', ' ', ' '), '', $buffer);
return $buffer;
}
include('galleria.css');
include('articles.css');
ob_end_flush();
使用方法如下:
复制代码 代码如下:test
2. 压缩js,利用jsmin类:
本实例源自:http://code.google.com/p/minify/
复制代码 代码如下:header('Content-type: text/javascript');
require 'jsmin.php';
echo JSMin::minify(file_get_contents('common.js') . file_get_contents('common2.js'));
其中jsmin.php文件如下：
复制代码 代码如下:
class JSMin {
const ORD_LF = 10;
const ORD_SPACE = 32;
const ACTION_KEEP_A = 1;
const ACTION_DELETE_A = 2;
const ACTION_DELETE_A_B = 3;
protected $a = '';
protected $b = '';
protected $input = '';
protected $inputIndex = 0;
protected $inputLength = 0;
protected $lookAhead = null;
protected $output = '';
// -- Public Static Methods --------------------------------------------------
public static function minify($js) {
$jsmin = new JSMin($js);
return $jsmin->min();
}
// -- Public Instance Methods ------------------------------------------------
public function __construct($input) {
$this->input = str_replace("rn", "n", $input);
$this->inputLength = strlen($this->input);
}
// -- Protected Instance Methods ---------------------------------------------
protected function action($command) {
switch($command) {
case self::ACTION_KEEP_A:
$this->output .= $this->a;
case self::ACTION_DELETE_A:
$this->a = $this->b;
if ($this->a === "'" || $this->a === '"') {
for (;;) {
$this->output .= $this->a;
$this->a = $this->get();
if ($this->a === $this->b) {
break;
}
if (ord($this->a) <= self::ORD_LF) {
throw new JSMinException('Unterminated string literal.');
}
if ($this->a === '\') {
$this->output .= $this->a;
$this->a = $this->get();
}
}
}
case self::ACTION_DELETE_A_B:
$this->b = $this->next();
if ($this->b === '/' && (
$this->a === '(' || $this->a === ',' || $this->a === '=' ||
$this->a === ':' || $this->a === '[' || $this->a === '!' ||
$this->a === '&' || $this->a === '|' || $this->a === '?' ||
$this->a === '{' || $this->a === '}' || $this->a === ';' ||
$this->a === "n" )) {
$this->output .= $this->a . $this->b;
for (;;) {
$this->a = $this->get();
if ($this->a === '[') {
for (;;) {
$this->output .= $this->a;
$this->a = $this->get();
if ($this->a === ']') {
break;
} elseif ($this->a === '\') {
$this->output .= $this->a;
$this->a = $this->get();
} elseif (ord($this->a) <= self::ORD_LF) {
throw new JSMinException('Unterminated regular expression set in regex literal.');
}
}
} elseif ($this->a === '/') {
break;
} elseif ($this->a === '\') {
$this->output .= $this->a;
$this->a = $this->get();
} elseif (ord($this->a) <= self::ORD_LF) {
throw new JSMinException('Unterminated regular expression literal.');
}
$this->output .= $this->a;
}
$this->b = $this->next();
}
}
}
protected function get() {
$c = $this->lookAhead;
$this->lookAhead = null;
if ($c === null) {
if ($this->inputIndex < $this->inputLength) {
$c = substr($this->input, $this->inputIndex, 1);
$this->inputIndex += 1;
} else {
$c = null;
}
}
if ($c === "r") {
return "n";
}
if ($c === null || $c === "n" || ord($c) >= self::ORD_SPACE) {
return $c;
}
return ' ';
}
protected function isAlphaNum($c) {
return ord($c) > 126 || $c === '\' || preg_match('/^[w$]$/', $c) === 1;
}
protected function min() {
if (0 == strncmp($this->peek(), "xef", 1)) {
$this->get();
$this->get();
$this->get();
}
$this->a = "n";
$this->action(self::ACTION_DELETE_A_B);
while ($this->a !== null) {
switch ($this->a) {
case ' ':
if ($this->isAlphaNum($this->b)) {
$this->action(self::ACTION_KEEP_A);
} else {
$this->action(self::ACTION_DELETE_A);
}
break;
case "n":
switch ($this->b) {
case '{':
case '[':
case '(':
case '+':
case '-':
case '!':
case '~':
$this->action(self::ACTION_KEEP_A);
break;
case ' ':
$this->action(self::ACTION_DELETE_A_B);
break;
default:
if ($this->isAlphaNum($this->b)) {
$this->action(self::ACTION_KEEP_A);
}
else {
$this->action(self::ACTION_DELETE_A);
}
}
break;
default:
switch ($this->b) {
case ' ':
if ($this->isAlphaNum($this->a)) {
$this->action(self::ACTION_KEEP_A);
break;
}
$this->action(self::ACTION_DELETE_A_B);
break;
case "n":
switch ($this->a) {
case '}':
case ']':
case ')':
case '+':
case '-':
case '"':
case "'":
$this->action(self::ACTION_KEEP_A);
break;
default:
if ($this->isAlphaNum($this->a)) {
$this->action(self::ACTION_KEEP_A);
}
else {
$this->action(self::ACTION_DELETE_A_B);
}
}
break;
default:
$this->action(self::ACTION_KEEP_A);
break;
}
}
}
return $this->output;
}
protected function next() {
$c = $this->get();
if ($c === '/') {
switch($this->peek()) {
case '/':
for (;;) {
$c = $this->get();
if (ord($c) <= self::ORD_LF) {
return $c;
}
}
case '*':
$this->get();
for (;;) {
switch($this->get()) {
case '*':
if ($this->peek() === '/') {
$this->get();
return ' ';
}
break;
case null:
throw new JSMinException('Unterminated comment.');
}
}
default:
return $c;
}
}
return $c;
}
protected function peek() {
$this->lookAhead = $this->get();
return $this->lookAhead;
}
}
// -- Exceptions ---------------------------------------------------------------
class JSMinException extends Exception {}
?>
希望本文所述对大家的php程序设计有所帮助。
