二叉树的宽度优先遍历（队列实现）

<?php
header("Content-type: text/html; charset=utf-8");

$json = <<<JSON
{"total":28,"rows":[
	{"id":1,"name":"xiongchuanliang","pwd":"xcl","status":"A"},
	{"id":2,"name":"zj","pwd":"zj","status":"D"}
]}
JSON;

echo "PHP与JSON测试";
echo ‘<pre>‘;
//将JSON字符串变为JSON
echo json_encode($json);
echo ‘</pre>‘;

echo ‘<pre>‘;
$errJson[] = "{‘Organization‘: ‘PHP Documentation Team‘}";
foreach ($errJson as $string) {
    echo ‘Decoding: ‘ . $string;    
    json_decode($string);

    switch (json_last_error()) {
        case JSON_ERROR_NONE:
            echo ‘ - No errors‘;
        break;
        case JSON_ERROR_DEPTH:
            echo ‘ - Maximum stack depth exceeded‘;
        break;
        case JSON_ERROR_STATE_MISMATCH:
            echo ‘ - Underflow or the modes mismatch‘;
        break;
        case JSON_ERROR_CTRL_CHAR:
            echo ‘ - Unexpected control character found‘;
        break;
        case JSON_ERROR_SYNTAX:
            echo ‘ - Syntax error, malformed JSON‘;
        break;
        case JSON_ERROR_UTF8:
            echo ‘ - Malformed UTF-8 characters, possibly incorrectly encoded‘;
        break;
        default:
            echo ‘ - Unknown error‘;
        break;
    }

    echo PHP_EOL;
}
echo ‘</pre>‘;

?>

<?php
header("Content-type: text/html; charset=utf-8");

//如何快速从MySQL表中取值组合成JSON
include ‘inc/xcl_conn.php‘;

$result = array();	
$rs = mysql_query("select count(*) from users");
$row = mysql_fetch_row($rs);
$result["total"] = $row[0];

$sql=" SELECT id,name,pwd,status FROM users";
$rs = mysql_query($sql);
	
$items = array();
while($row = mysql_fetch_object($rs)){
	array_push($items, $row);
}
$result["rows"] = $items;

echo json_encode($result);

?>