$data='[{"user_id":"93","price":"52.50"},{"user_id":"93","price":"52.50"},{"user_id":"93","price":"52.50"}]';
$jsonObj = json_decode($data,true);
var_dump($jsonObj);

array (size=3)0 => array (size=2)'user_id' => string '93' (length=2)'price' => string '52.50' (length=5)1 => array (size=2)'user_id' => string '93' (length=2)'price' => string '52.50' (length=5)2 => array (size=2)'user_id' => string '93' (length=2)'price' => string '52.50' (length=5)

 $sql = "SELECT * " ."FROM goods WHERE is_hot = 1";$row = $GLOBALS['db']->getAll($sql);var_dump($row);

array (size=10)0 => array (size=52)'goods_id' => string '1089' (length=4)'cat_id' => string '310' (length=3)'goods_sn' => string 'ECS001201' (length=9)'goods_name' => string '喇叭袖中长上衣夏季短袖T恤打底裙' (length=86)1 => array (size=52)'goods_id' => string '1099' (length=4)'cat_id' => string '336' (length=3)'goods_sn' => string 'ESCOO1105' (length=9)'goods_name' => string '榄油菜籽油玉米植物调和油商超同款' (length=86)2 => array (size=52)'goods_id' => string '1110' (length=4)'cat_id' => string '336' (length=3)'goods_sn' => string 'ECS001110' (length=9)'goods_name' => string '自榨菜油5l食用油非转基因粮油' (length=88)

//定义一个数组
$allowArr=array();
//把从数据库库中获取的[{"user_id":"93","user_name":"james","price":"88"},{"user_id":"293","user_name":"139335","price":"52.50"}]字符串转换为数组对象
$allowMemberArr=json_decode($allowMember); //这里注意如果使用的是$allowMemberArr=json_decode($allowMember,true);遍历取值的时候要用$row['user_id'],而不是$row->user_id

//遍历并添加到数组行
foreach ($allowMemberArr as $key=>$row) {$allowArr[] = array('user_id' => $row->user_id, 'user_name' => $row->user_name, 'price' => $row->price);
}
//添加一个数组行
$allowArr[]=array('user_id'=>$user_id,'user_name'=>$user_name,'price'=>$price);
//把所有已经添加的数组行转换为JSON字符串，然后就可以保存了（JSON_UNESCAPED_UNICODE 防止中文乱码）
$jsonString =json_encode($allowArr,JSON_UNESCAPED_UNICODE);

$allowArr=array();$allowMemberArr=json_decode($allowMember);foreach ($allowMemberArr as $key=>$row){if($row->user_id!=$userId){$allowArr[]=array('user_id'=>$row->user_id,'user_name'=>$row->user_name,'price'=>$row->price);}}

//如果按JSON来说，解决的形如：["Peter", "Joe", "Glenn", "Cleveland"]方式

$people = array("Peter", "Joe", "Glenn", "Cleveland");
if(in_array("Glenn",$people)){echo "Match found";
}else{echo "Match not found";
}输出：
Match found
//与下面这种方式是一样的，如：$arrStr='["20","60","55"]';这种类型的字符串,如果用它进行比较需要转换为数组：$arr=$json->decode($_GET['ids']);这种方法可以解决如：go.php?act=drop_group_users&ids=["287","294","302"]
if(in_array("60",$arr)){echo "Match found";
}else{echo "Match not found";
}

//如果按JSON来说，解决的形如：{"a":"Dog","b":“Cat"}方式
$a=array("a"=>"Dog","b"=>"Cat");
if(array_key_exists("a",$a)){
echo "Key exists!";
}else{
echo "Key does not exist!";
}输出：Key exists!

$a=array("a"=>"Dog","b"=>"Cat","c"=>5,"d"=>"5");
echo array_search("Dog",$a);
echo array_search("5",$a);

输出：
ad