Methods for php array output

This article is a detailed analysis and introduction to the three forms of PHP array (array) output. For those who need it, please refer to

The code is as follows:

$bbbb=array("11"=>"aaa","22"=>"bbb");
//只能输出值value不能输出key
foreach($bbbb as $color)
{
　　echo $color;
}
//value与key都可输出
foreach($bbbb as $key=>$value)
{
　　echo $key."=>".$value;
}
//value与key都可输出
while($color=each($bbbb)){
　　echo $color['key'];
}
或
while(list($key,$value)=each($bbbb)){
　　echo "$key : $value<br>";
}

Direct access to array elements ：

The code is as follows:

<?php
$arr=array(&#39;w&#39;=>&#39;wen&#39;,&#39;j&#39;=>&#39;jian&#39;,&#39;b&#39;=>&#39;bao&#39;);
echo($arr[&#39;w&#39;]),&#39;<br/>&#39;;//起作用
echo($arr[w]),&#39;<br/>&#39;;//起作用
echo($arr[0]),&#39;<br/>&#39;;//不起作用，不知为什么？？？
echo($arr[&#39;j&#39;]),&#39;<br/>&#39;;//起作用
echo($arr[j]),&#39;<br/>&#39;;//起作用
echo($arr[1]),&#39;<br/>&#39;;//不起作用，不知为什么？？？
echo($arr[&#39;b&#39;]),&#39;<br/>&#39;;//起作用
echo($arr[b]),&#39;<br/>&#39;;//起作用
echo($arr[2]),&#39;<br/>&#39;;//不起作用，不知为什么？？？
?>

Output:

The code is as follows:

wen
wen
jian
jian
bao
bao

Suspicious points:
Accessing associative array elements,
1. Can the "key" in [ ] be accessed without using quotation marks ("")? ? ?
　2. Array index access doesn’t work? ? ?

The code is as follows:

<?php
$arr1=array(&#39;wen&#39;,&#39;jian&#39;,&#39;bao&#39;);
echo $arr1[0],&#39;<br/>&#39;,$arr1[1],&#39;<br/>&#39;,$arr1[2];
?>

Output:

The code is as follows:

wen
jian
bao

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