在php中删除给定数组键的元素

Question

    $nesAry=array();
$nesAry["name"]="abc";
$nesAry["email"]="abc@email.com";

$nesAry1=array();
$nesAry1["name"]="abc1";
$nesAry1["email"]="abc1@email.com";

$nesAry2=array();
$nesAry2["name"]="abc2";
$nesAry2["email"]="abc2@email.com";


$responseAry = array();
$responseAry[0]=$nesAry;
$responseAry[1]=$nesAry1;
$responseAry[2]=$nesAry2;


echo json_encode($responseAry); // here  output like this => [{"name":"abc","email":"abc@email.com"},{"name":"abc1","email":"abc1@email.com"},{"name":"abc2","email":"abc2@email.com"}]

unset($responseAry[1]);

echo "------------removed 1--------";


echo json_encode($responseAry); // but here output like this => {"0":{"name":"abc","email":"abc@email.com"},"2":{"name":"abc2","email":"abc2@email.com"}}

我想在删除一个元素后像这样输出 \n [{"name":"abc","email":"abc@email.com"},{"name":"abc2", "电子邮件":"abc2@email.com"}]

请帮帮我

Answer 1

您的数组在第一次转换为 json 时是一个所谓的“关联”数组，然后 json_encode 将其导出到您在第一个回显中看到的对象。

在您取消设置后，该数组将更改为“数字”数组，并且 json_encode 将使用数组键导出该数组。

php 它自己不关心数组的使用方式，但是 json_encode 关心。

你可以使用

echo json_encode(array_values($responseAry));

或者不更改要导出的最终数组

Answer 2

尝试在取消设置项目后重新生成数组：

$nesAry=array();
$nesAry["name"]="abc";
$nesAry["email"]="abc@email.com";

$nesAry1=array();
$nesAry1["name"]="abc1";
$nesAry1["email"]="abc1@email.com";

$nesAry2=array();
$nesAry2["name"]="abc2";
$nesAry2["email"]="abc2@email.com";


$responseAry = array();
$responseAry[0]=$nesAry;
$responseAry[1]=$nesAry1;
$responseAry[2]=$nesAry2;


echo json_encode($responseAry); // __here  output like this => [{"name":"abc","email":"abc2@email.com"},{"name":"abc1","email":"abc1@email.com"},{"name":"abc2"}]__

unset($responseAry[1]);

$responseAry = array_values($responseAry); //regenerate array(reindexing)

echo "------------removed 1--------";


echo json_encode($responseAry); //[{"name":"abc","email":"abc@email.com"},{"name":"abc2","email":"abc2@email.com"}]

编辑：

作为其他选项，您可以使用array_splice 方法http://php.net/manual/en/function.array-splice.php

$nesAry=array();
$nesAry["name"]="abc";
$nesAry["email"]="abc@email.com";

$nesAry1=array();
$nesAry1["name"]="abc1";
$nesAry1["email"]="abc1@email.com";

$nesAry2=array();
$nesAry2["name"]="abc2";
$nesAry2["email"]="abc2@email.com";


$responseAry = array();
$responseAry[0]=$nesAry;
$responseAry[1]=$nesAry1;
$responseAry[2]=$nesAry2;


echo json_encode($responseAry); // __here  output like this => [{"name":"abc","email":"abc2@email.com"},{"name":"abc1","email":"abc1@email.com"},{"name":"abc2"}]__

array_splice($responseAry,1,1);
echo "------------removed 1--------";


echo json_encode($responseAry);