Basic curl example

Una volta che hai compilato PHP con il supporto cURL, puoi iniziare ad usare le funzioni cURL. L'idea di base dietro le funzioni cURL รจ inizializzare una funzione curl utilizzando curl_init(), settarne le opzioni per il trasferimento usando curl_setopt(), successivamente eseguirla con curl_exec() e terminare la session tramite curl_close(). Ecco un esempio che usa le funzioni cURL per scaricare l'homepage di example.com e memorizzarla in un file:

Example #1 Utilizzo del modulo cURL di PHP per scaricare l'homepage di example.com

<?php

$ch 
curl_init("http://www.example.com/");
$fp fopen("example_homepage.txt""w");

curl_setopt($chCURLOPT_FILE$fp);
curl_setopt($chCURLOPT_HEADER0);

curl_exec($ch);
curl_close($ch);
fclose($fp);
?>

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User Contributed Notes 3 notes

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5
simon dot riget at gmail dot com
11 months ago
Using ArangoDB with PHP

Coding with a NoSQL data base like ArangoDB can be made more complicated then need be. A simple solution to code for ArangoDB is to use the REST interface directly.
All you need is a few initialization variables and a small function to ease the typing - and of cause install the php5-curls module...
See ArangoDB REST API documentation for options and request types.

<?php
// Initialize options for REST interface
$adb_url="http://127.0.0.1:8529";
$adb_option_defaults = array(
   
CURLOPT_HEADER => false,
   
CURLOPT_RETURNTRANSFER => true,
   
CURLOPT_TIMEOUT => 2
 
);

// ArangoDB REST function.
// Connection are created demand and closed by PHP on exit.
function adb_rest($method,$uri,$querry=NULL,$json=NULL,$options=NULL){
  global
$adb_url,$adb_handle,$adb_option_defaults;

 
// Connect
 
if(!isset($adb_handle)) $adb_handle = curl_init();

  echo
"DB operation: $method $uri $querry $json\n";

 
// Compose querry
 
$options = array(
   
CURLOPT_URL => $adb_url.$uri."?".$querry,
   
CURLOPT_CUSTOMREQUEST => $method, // GET POST PUT PATCH DELETE HEAD OPTIONS
   
CURLOPT_POSTFIELDS => $json,
  );
 
curl_setopt_array($adb_handle,($options + $adb_option_defaults));

 
// send request and wait for responce
 
$responce json_decode(curl_exec($adb_handle),true);

  echo
"Responce from DB: \n";
 
print_r($responce);
 
  return(
$responce);
}
?>

Here's some examples:

<?php
// Create a collection
$responce = adb_rest("POST","/_api/collection","",'{"name" : "test"}');

// Create a document
$responce = adb_rest("POST","/_api/document","collection=test",'{ "hello" : "World" }');

// List documents in a collection
$responce=adb_rest("GET","/_api/document","collection=test");

// Change document
$document_handle=$responce['documents'][0];
$responce=adb_rest("PATCH",$document_handle,"",'{ "hello" : "World of mine" }');

// Show document
$responce=adb_rest("GET",$document_handle);

// Search
$responce=adb_rest("POST","/_api/cursor","",'{
  "query" : "FOR t IN test RETURN t",
  "count" : true,
  "batchSize" : 50
}'
);

while(
$responce['hasMore'])
 
$responce=adb_rest("PUT","/_api/cursor/".$responce['id']);

// Delete document
$responce=adb_rest("DELETE",$document_handle);

// DB Delete collection
$responce=adb_rest("DELETE","/_api/collection/test");

// to handle errors, add something like this:
if($responce['error']) die ("can't create collection");

?>
up
-1
Anon
2 months ago
The example fetches a resource (the homepage of a website) and writes it to the the file represented by $fp.

Judging from comments elsewhere in this chapter, the example given ought to set CURLOPT_RETURNTRANSFER to true prior to setting CURLOPT_FILE.
up
-2
Anon
2 months ago
IMO this example would have been better if it had done a check for curl_error(), in order to advertize the existence of this function to people learning about cURL who try the example but mysteriously get no response back for whatever reason.
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