How to convert php array to json string

How to convert php array to json string: first create a php sample file; then define a set of array data; finally convert the array into a json string through the "json_encode($color)" method.

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Convert array/object in PHP to JSON string

The code is as follows:

<?php
 
//php语言生成json字符串
//json_encode(数组/对象);
 
//① 索引数组-->JavaScript数组
$color = array(&#39;gold&#39;,&#39;yellow&#39;,&#39;blue&#39;);
echo json_encode($color)."<br />";// ["gold","yellow","blue"]
 
//② 关联数组-->json字符串
$city = array(&#39;shandong&#39;=>&#39;jinan&#39;,&#39;henan&#39;=>&#39;zhengzhou&#39;,&#39;hebei&#39;=>&#39;shijiazhuang&#39;);
echo json_encode($city)."<br />";//{"shandong":"jinan","henan":"zhengzhou","hebei":"shijiazhuang"}
 
//③ 索引关联数组-->json字符串
$city2 = array(&#39;shandong&#39;=>&#39;jinan&#39;,&#39;henan&#39;=>&#39;zhengzhou&#39;,&#39;shenyang&#39;,&#39;hebei&#39;=>&#39;shijiazhuang&#39;);
echo json_encode($city2)."<br />";//{"shandong":"jinan","henan":"zhengzhou","0":"shenyang","hebei":"shijiazhuang"}
 
//④ 对象生成json信息-->json字符串
//   (只会序列化"成员属性"，不会序列化"成员方法")
class Person{
    //类内部的成员属性需要有修饰符(var/public/protected/private)，其是固定语法
    public $color = "yellow";
    var $height = 170;
    function run(){
        echo "is running";
    }
}
$tom = new Person();
echo json_encode($tom);  //{"color":"yellow","height":170}

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