New function to search on Solr record ID

site/public/id_search.php

+<?php
+
+# @name: id_search.php
+# @version: 0.1
+# @creation_date: 2021-09-30
+# @license: The MIT License <https://opensource.org/licenses/MIT>
+# @author: Simon Bowie <ad7588@coventry.ac.uk>
+# @purpose: Searches the Solr index by ID for one particular record
+
+include '../solr.php';
+
+?>
+
+<?php
+
+  $search_results = solr_search_id($_GET["id"]);
+
+  foreach($search_results as $result):
+
+?>
+    Application ID:
+
+    <?php
+    echo $result['application_id'];
+    ?>
+
+    <br><br>
+
+    EPO publication:
+
+    <a href=<?php echo $result['epo_publication_url']; ?>>
+      <?php
+      echo $result['epo_publication_url'];
+      ?>
+    </a>
+
+    <br><br>
+
+    IPC publication:
+
+    <a href=<?php echo $result['ipc_publication_url']; ?>>
+      <?php
+      echo $result['ipc_publication_url'];
+      ?>
+    </a>
+
+    <br><br>
+
+    Title:
+
+    <?php
+    echo $result['title'];
+    ?>
+
+    <br><br>
+
+    <?php
+    if ($result['abstract']):
+    ?>
+
+    Abstract:
+
+      <?php
+      echo $result['abstract'];
+      ?>
+
+    <br><br>
+
+    <?
+    endif;
+    ?>
+
+<?php
+  endforeach;
+?>

site/public/titles.php

 
 <?php
 
-foreach ($random_titles as $title):
+foreach ($random_titles as $record_array):
 
 ?>
 
 <?
-  echo $title;
+  foreach ($record_array as $id => $title):
+?>
+  <a href="id_search.php?id=<? echo $id; ?>">
+<?
+    echo $title;
+?>
+  </a>
+<?
+  endforeach;
 ?>
 
   <br><br>

site/solr.php

 function solr_search($search){
 
   // Assemble a query string to send to Solr. This uses the Solr hostname from config.env. Solr's query syntax can be found at many sites including https://lucene.apache.org/solr/guide/6_6/the-standard-query-parser.html
-  // This query retrieves only the bib identifier field for records which satisfy the search query
   $solrurl = 'http://' . $_ENV["SOLR_HOSTNAME"] . ':' . $_ENV["SOLR_PORT"] . '/solr/' . $_ENV["SOLR_CORE"] . '/select?q.op=OR&q=content%3A' . $search . '&wt=json';
 
   // Perform Curl request on the Solr API
   return $results;
 }
 
+function solr_search_id($id){
+
+  // URL encode the ID string
+  $id = urlencode($id);
+
+  // Assemble a query string to send to Solr. This uses the Solr hostname from config.env. Solr's query syntax can be found at many sites including https://lucene.apache.org/solr/guide/6_6/the-standard-query-parser.html
+  $solrurl = 'http://' . $_ENV["SOLR_HOSTNAME"] . ':' . $_ENV["SOLR_PORT"] . '/solr/' . $_ENV["SOLR_CORE"] . '/select?q.op=OR&q=id%3A"' . $id . '"&wt=json';
+
+  // Perform Curl request on the Solr API
+  $ch = curl_init();
+  curl_setopt($ch, CURLOPT_URL, $solrurl);
+  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
+  curl_setopt($ch, CURLOPT_HEADER, FALSE);
+  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
+  $response = curl_exec($ch);
+  curl_close($ch);
+
+  // Turn the API response into useful Json
+  $json = json_decode($response);
+
+  // If no results are found, display a message
+  if ($json->response->numFound == '0'){
+    $output = 'No results found';
+  }
+  else{
+    foreach ($json->response->docs as $result){
+      $content = $result->content;
+      $result_output = parse_result($content);
+      $results[] = $result_output;
+    }
+  }
+  return $results;
+}
+
 function parse_result($input){
 
   //Set document reference number (used for OPS API)
     // Pick a random key out of the docs array
     $random = array_rand($json->response->docs);
 
+    //Set ID variable
+    $id = $json->response->docs[$random]->id;
+
     //Set content variable
     $content = $json->response->docs[$random]->content;
 
-    return $content;
+    //Construct associative array with ID and content
+    $result_array = array($id=>$content);
+
+    return $result_array;
 }
 
 function one_random_record (){
 
-  $content = get_random_record();
+  $random = get_random_record();
 
-  $output = parse_result($content);
+  foreach ($random as $id => $content){
+    $output = parse_result($content);
+  }
 
   return $output;
 
 
   for ($x=0; $x <= 9; $x++) {
     $random = get_random_record();
-    // Search for the title in the content element and display it
-    preg_match('/Title.*\n(.*)\n/', $random, $title);
-    $output[$x] = $title[1];
+
+      foreach($random as $id => $content){
+        // Search for the title in the content element and display it
+        preg_match('/Title.*\n(.*)\n/', $content, $title);
+
+        $output[$x] = array($id=>$title[1]);
+
+      }
   }
 
   return $output;