Simple entry case for PHP array

Arrays can store one or more values ​​in separate variable names. This article mainly shares with you a simple entry-level case of PHP arrays, hoping to help you.

<?php
    //普通声明
    $arr = array(&#39;aaa&#39;,&#39;bbbb&#39;,&#39;ccccc&#39;);    echo $arr[0],&#39;<br>&#39;;    echo $arr[2],&#39;<br>&#39;,&#39;<br>&#39;;    $arr1[] = &#39;xxxx&#39;;    $arr1[] = &#39;yyyyy&#39;;
    print_r($arr1);    //键值对方式声明数组。
    $kv = array(&#39;name&#39;=>&#39;张三&#39;,&#39;sex&#39;=>&#39;男&#39;,&#39;age&#39;=>18);    echo $kv[&#39;name&#39;],&#39;<br>&#39;;    echo $kv[&#39;sex&#39;],&#39;<br>&#39;;    echo $kv[&#39;age&#39;],&#39;<br>&#39;;    //数组声明二
    $skv[&#39;x&#39;] = &#39;xxxx&#39;;    $skv[&#39;y&#39;] = &#39;yyyyy&#39;;
    print_r($skv);    echo &#39;<br>&#39;;    //特殊情况：字符串‘10’ 和 数字10 在数组中会转换成数字10 。 
    $test[&#39;10&#39;] = &#39;张三&#39;;    $test[10] = &#39;丽丽&#39;;    $test[&#39;10.0&#39;] = &#39;隔壁&#39;;//加小数点后的字符串不会被转换成数字。***
    //小数会取整后，都是9 同样会覆盖。
    $test[9.12] = &#39;老王&#39;;    $test[9.14] = &#39;丽丽&#39;;    //&#39;&#39; 在数组中等同意 null 也会被覆盖
    $test[&#39;&#39;] = &#39;马云&#39;;    $test[null] = &#39;丽丽&#39;;
    print_r($test);    //通过 extract 函数 将数组中的变量，导出成对象和值：
    extract($kv);    echo &#39;<br>&#39;,$name,&#39;<br>&#39;,$sex,&#39;<br>&#39;,$age;?>

The output is as follows:

aaa
cccccArray ( [0] => xxxx [1] => yyyyy ) 张三
男18Array ( [x] => xxxx [y] => yyyyy ) 
Array ( [10] => 丽丽 [10.0] => 隔壁 [9] => 丽丽 [] => 丽丽 )
张三
男18

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