Submit json format data using PHP's curl extension

Example code

<code><span>$ch</span> = curl_init();
curl_setopt_array(<span>$ch</span>, [
        CURLOPT_RETURNTRANSFER=><span>true</span>,
        CURLOPT_POST=><span>true</span>,
        CURLOPT_HEADER=><span>false</span>,
        CURLOPT_TIMEOUT=><span>30</span>,
        CURLOPT_HTTPHEADER=>[<span>"Content-type:application/json"</span>],
        CURLOPT_URL=><span>"http://localhost/city"</span>,
        CURLOPT_POSTFIELDS=><span>'{"province_id":39}'</span>,
        ]);

<span>$result</span> = curl_exec(<span>$ch</span>);

print_r(<span>$result</span>);</code>

Return result:

<code>{"<span>code</span>":<span><span>1</span></span>,"<span>data</span>":<span>[{"<span>id</span>":<span><span>"40"</span></span>,"<span>name</span>":<span><span>"石家庄市"</span></span>},{"<span>id</span>":<span><span>"64"</span></span>,"<span>name</span>":<span><span>"唐山市"</span></span>},{"<span>id</span>":<span><span>"80"</span></span>,"<span>name</span>":<span><span>"秦皇岛市"</span></span>},{"<span>id</span>":<span><span>"89"</span></span>,"<span>name</span>":<span><span>"邯郸市"</span></span>},{"<span>id</span>":<span><span>"110"</span></span>,"<span>name</span>":<span><span>"邢台市"</span></span>},{"<span>id</span>":<span><span>"131"</span></span>,"<span>name</span>":<span><span>"保定市"</span></span>},{"<span>id</span>":<span><span>"158"</span></span>,"<span>name</span>":<span><span>"张家口市"</span></span>},{"<span>id</span>":<span><span>"177"</span></span>,"<span>name</span>":<span><span>"承德市"</span></span>},{"<span>id</span>":<span><span>"190"</span></span>,"<span>name</span>":<span><span>"沧州市"</span></span>},{"<span>id</span>":<span><span>"208"</span></span>,"<span>name</span>":<span><span>"廊坊市"</span></span>},{"<span>id</span>":<span><span>"220"</span></span>,"<span>name</span>":<span><span>"衡水市"</span></span>}]</span>}</code>

Explanation:

The default value of CURLOPT_HEADER is false, so the above option does not need to be set
If you do not pass data in json format, you can use http_build_query to create the value of CURLOPT_POSTFIELDS (in the form similar to name=tom&age=25)

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The above introduces the use of PHP's curl extension to submit json format data, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.