php数组运算符和三元运算符

数组运算符

+号运算符(合并数组)

<?php
$a = [
    "a" => '1',
    "b" => '2'
];
$b = [
    "c" => '3',
    "d" => '4',
    "e" => [
        "f" => "5"
    ]
];
print_r($a + $b);
print_r(array_merge($a, $b)); // array_merge() 函数合并取最新值

• ==
• ===

<?php
$a = [1,2,3,4,5,6,7,8,9];
$b = [1,2,3,4,5,6,7,8,"9"];

var_dump($a == $b); //true
var_dump($a === $b); //false

• != 或 <>
• !==

三元运算符

<?php

$name = isset($username) ? $username : "测试";
$name = $username ?: "测试";

var_dump($name);