php 常见问题及解决方法

(1)请求要素是json字符串,后台如何获取

//this is a common php library by huangwei ,//date:2014-07-03//see http://blog.sina.com.cn/s/blog_4657e98e0100dyxp.html//see http://www.cnblogs.com/fullhouse/archive/2012/04/24/2468870.htmlif(array_key_exists('HTTP_RAW_POST_DATA',$GLOBALS)){//判断是否有key-HTTP_RAW_POST_DATA$raw_data=$GLOBALS['HTTP_RAW_POST_DATA'];//always_populate_raw_post_data = On}if (empty($raw_data)) {	$raw_data=$_POST;}if (empty($raw_data)) { 	//echo "raw_data is empty"; 	$raw_data=file_get_contents("php://input"); }if(empty($raw_data)) {    $raw_data=$_GET;}if(empty($raw_data)) {    $raw_data=$_POST;}

(2)如何把接收到的json字符串转化为对象

$post_object = json_decode($raw_data);

(3)如何把json对象转化为数组

//convert object to arrayfunction object_to_array($obj){    if(is_array($obj)){        return $obj;    }	$_arr = is_object($obj)? get_object_vars($obj) :$obj;	foreach ($_arr as $key => $val){	$val=(is_array($val)) || is_object($val) ? object_to_array($val) :$val;	$arr[$key] = $val;	}	return $arr;     }

(4)获取php服务器操作系统类型

/*** * @return string : windows or linux */function serverOS(){    $os_name=strtolower(php_uname('s'));    $os_pos=strpos($os_name,'linux');    if($os_pos === false) {        return "windows";    }    else {        return "linux";    }}

应用:

$root_path_index;//echo serverOS();if(serverOS()=='linux'){    $root_path_index=-9;}else{    $root_path_index=32;}$config['webroot']=substr(dirname(__FILE__), 0, $root_path_index);///var/www/html/exchange

(5)字符串a是否包含字符串b

function strexists($a, $b){	return !(strpos($a, $b) === FALSE);}

(6)递归创建文件夹

function mkdirs($dir){    	return is_dir($dir) or (mkdirs(dirname($dir)) and mkdir($dir, 0777));}

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