Teach you how to add variables to PHP strings_PHP Tutorial

We are using but need to add variable descriptions to the PHP string, although the following example has no errors:

<ol class="dp-xml">
<li class="alt">
<span><strong><font color="#006699"><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN>   </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>temp</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>("one" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong></span><span> 1, "two" =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> 2);   </span>
</li>
<li class="alt"><span>// 输出：: The first element is 1   </span></li>
<li class=""><span>echo "The first element is $temp[one].";   </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
</li>
</ol>

But if the following echo statement is not enclosed in double quotes, an error will be reported, so it is recommended to use curly braces:

<ol class="dp-xml">
<li class="alt">
<span><strong><font color="#006699"><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN>   </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>temp</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>("one" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong></span><span> 1, "two" =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> 2);   </span>
</li>
<li class="alt"><span>echo "The first element is {$temp["one"]}.";   </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
</li>
</ol>

The above is the specific solution for adding variables to PHP strings.

http://www.bkjia.com/PHPjc/446370.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446370.htmlTechArticleWhat we need to add to the PHP string is the variable description, although the following example has no errors: ? php $ temp = array ("one"= 1,"two"= 2); //Output: :Thefirstelementis1...