php curl library code example

Example 1: php curl

// set post fields
$post = [
    'username' => 'user1',
    'password' => 'passuser1',
    'gender'   => 1,
];

$ch = curl_init('http://www.example.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

// execute!
$response = curl_exec($ch);

// close the connection, release resources used
curl_close($ch);

// do anything you want with your response
var_dump($response);

Example 2: php curl get

PHP cURL GET Request
A GET request retrieves data from a server. This can be a website’s HTML, an API response or other resources.

<?php

$cURLConnection = curl_init();

curl_setopt($cURLConnection, CURLOPT_URL, 'https://hostname.tld/phone-list');
curl_setopt($cURLConnection, CURLOPT_RETURNTRANSFER, true);

$phoneList = curl_exec($cURLConnection);
curl_close($cURLConnection);

$jsonArrayResponse - json_decode($phoneList);

Example 3: php curl example

function getUrl($url){
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    $response = curl_exec($ch);
    curl_close($ch);
    return $response;
}

Example 4: curl php

// Initialize Curl 
 $curl = curl_init();
 curl_setopt($curl, CURLOPT_URL, "https://coinmarketcap.com/"); // set live website where data from
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE); // default
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); // default
 $content = curl_exec($curl);

 preg_match_all('!<p color="text3" class="sc-AxhUy bzeXdk coin-item-symbol" font-size="1">(.*?)</p>!', $content, $matches);

 var_dump($matches);

Example 5: php use curl

It is important to notice that when using curl to post form data and you use an array for CURLOPT_POSTFIELDS option, the post will be in multipart format

<?php
$params=['name'=>'John', 'surname'=>'Doe', 'age'=>36)
$defaults = array(
CURLOPT_URL => 'http://myremoteservice/', 
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $params,
);
$ch = curl_init();
curl_setopt_array($ch, ($options + $defaults));
?>
This produce the following post header:

--------------------------fd1c4191862e3566
Content-Disposition: form-data; name="name"

Jhon
--------------------------fd1c4191862e3566
Content-Disposition: form-data; name="surnname"

Doe
--------------------------fd1c4191862e3566
Content-Disposition: form-data; name="age"

36
--------------------------fd1c4191862e3566--

Setting CURLOPT_POSTFIELDS as follow produce a standard post header

CURLOPT_POSTFIELDS => http_build_query($params),

Which is:
name=John&surname=Doe&age=36

This caused me 2 days of debug while interacting with a java service which was sensible to this difference, while the equivalent one in php got both format without problem.