129 lines
3.7 KiB
PHP
129 lines
3.7 KiB
PHP
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<?php
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/**
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* Description of doi
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*
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* @author may
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*/
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class doi {
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//put your code here
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public static $requests = 0;
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private $doi="x";
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public function __construct() {
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}
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// retrieves DOI data from thw doi server
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public static function fetchData($doi) {
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$data = -1;
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if (strlen ($doi) < 1) {
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return $data;
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}
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// check if it's already in the DB!
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if ($db_id = doi::isPublication($doi)) {
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return $db_id;
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}
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// limit number of requests (testing, importing huge databases, etc.
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else if (doi::$requests < DOI_REQ_LIMIT) {
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$ch = curl_init();
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$headers = array('Accept: application/x-bibtex');
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curl_setopt($ch, CURLOPT_URL, 'http://dx.doi.org/' .$doi);
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curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
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curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
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curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
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curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
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curl_setopt($ch, CURLOPT_TIMEOUT, 10);
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if ($res = curl_exec($ch)) {
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if(!curl_error($ch)) {
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$data = doi::_bibtex2arr($res);
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}
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}
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doi::$requests++;
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curl_close($ch);
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return $data;
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}
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else {
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return $data ." (OVER DOI_REQ_LIMIT!!!)";
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}
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}
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// check if we already have this DOI
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public static function isPublication($doi) {
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global $PDO;
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$d_arr = explode ("doi.org/", $doi);
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if (count ($d_arr)> 1) {
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$doi = $d_arr[1];
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}
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try {
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$stmt = $PDO->prepare("SELECT id FROM publication where doi=:doi");
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$stmt->execute(array($doi));
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// this instead of rowCount to make in compatible with non-mysql DB
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if ($r = $stmt->fetch(PDO::FETCH_NUM)) {
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return $r[0];
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}
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else {
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return false;
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}
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}
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catch (exception $ex) {
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common::except ('Err: ' .$ex .' in ' .__DIR__ .'/' .__FILE__ .':' .__LINE__);
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return false;
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}
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return false;
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}
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// converts from DOI to array (that canbe inserted into the DB)
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private static function _bibtex2arr($data) {
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$record = array();
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/*
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@article{R_der_2015,
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doi = {10.1111/imre.12113},
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url = {https://doi.org/10.1111%2Fimre.12113},
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year = 2015,
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month = {dec},
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publisher = {{SAGE} Publications},
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volume = {49},
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number = {4},
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pages = {1042--1070},
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author = {Antje Röder},
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title = {Immigrants' Attitudes toward Homosexuality: Socialization) Religion, and Acculturation in European Host Societies},
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journal = {International Migration Review}
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*
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* let's make it universal for all kinds of sources:
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- 1 data field (incl. name) per line (explode \n; trim \r; )
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- ' = ' is separator; explode, again and name and value. Make sure only to explode ONE TIME
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*/
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$line_arr = explode ("\n", $data);
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foreach ($line_arr as $line) {
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$fields = explode ("=", trim($line), 2);
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if (count ($fields) == 2) {
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$record[trim($fields[0])] = trim($fields[1], " \n\r\t\{\}\,");
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}
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}
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return $record;
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}
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}
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