去除php注释和去除空格函数分享

/**
* 去除代码中的空白和注释
* @param string $content 代码内容
* @return string
*/
function strip_whitespace($content) {
$stripStr = '';
//分析php源码
$tokens = token_get_all($content);
$last_space = false;
for ($i = 0,$j = count($tokens); $i < $j; $i++) {
if (is_string($tokens[$i])) {
$last_space = false;
$stripStr .= $tokens[$i];
} else {
switch ($tokens[$i][0]) {
//过滤各种PHP注释
case T_COMMENT:
case T_DOC_COMMENT:
break;
//过滤空格
case T_WHITESPACE:
if (!$last_space) {
$stripStr .= ' ';
$last_space = true;
}
break;
case T_START_HEREDOC:
$stripStr .= "<< break;
case T_END_HEREDOC:
$stripStr .= "THINK;n";
for($k = $i+1; $k < $j; $k++) {
if(is_string($tokens[$k]) && $tokens[$k] == ';') {
$i = $k;
break;
} else if($tokens[$k][0] == T_CLOSE_TAG) {
break;
}
}
break;
default:
$last_space = false;
$stripStr .= $tokens[$i][1];
}
}
}
return $stripStr;
}