老雷PHP基础入门视频教程之数组类型
老雷php视频教程之数组类型
PHP 中的数组实际上是一个有序映射。映射是一种把 values 关联到 keys 的类型
一、数组的定义
$arr=array();
$a=array("a","b","c");
$arr=[];
$a=["a","b","c"];
二、数组的key
1、默认数组是按0,1,2...
$a=array("a","b","c");
2、我们可以设置key值
//key a b c
$b=array(
"a"=>"aaa",
"b"=>"bbb",
"c"=>"ccc"
);
<?php $arr=array(); $a=array("a","b","c"); $arr=[]; $a=["a","b","c"]; print_r($a); $b=array( "a"=>"aaa", "b"=>"bbb", "c"=>"ccc" ); print_r($b);