カスタムフィールド（複数選択）はリクエストが厄介なので対応。

Author: takuya

src/lib/BacklogAPIClient.php

@@ -11,6 +11,7 @@
 use function Takuya\Utils\assert_str_is_domain;
 use League\Flysystem\WebDAV\WebDAVAdapter;
 use League\Flysystem\Filesystem;
+use function Takuya\Utils\array_map_with_key;
 
 class BacklogAPIClient {
 
@@ -167,10 +168,29 @@ public function call_api( $method, $path, $query = null, $params=null) {
 
     return $res->getBody()->getContents();
   }
-  protected function http_build_query($data,$numeric_prefix=false,$arg_separator=null,$encoding_type=PHP_QUERY_RFC3986){
-    $str = http_build_query($data,$numeric_prefix,$arg_separator=null,$encoding_type);
-    $str = preg_replace('/%5B(?:[0-9]|[1-9][0-9]+)%5D=/', '%5B%5D=', $str);
-    return $str;
+  protected function http_build_query($data,$numeric_prefix=false,$arg_separator=null,$encoding_type=PHP_QUERY_RFC3986) {
+    // custom field は複数キーが許可される。
+    $cust_array = array_filter( $data, fn( $v, $k ) => preg_match( '/custom/', $k ) && is_array( $v ),
+      ARRAY_FILTER_USE_BOTH );
+    if ( sizeof( $cust_array ) > 0 ) {
+      $cf_list = '&'.join( '&',
+          array_map_with_key( $cust_array, function( $k, $values ) {
+            return join( '&', array_map( fn( $v ) => sprintf( "%s=%s", urldecode( $k ), urlencode( $v ) ), $values ) );
+          } ) );
+    }else{
+      $cf_list = '';
+    }
+  
+    // bool値が name=1 になるのを避けて、 name=true にする。
+    array_walk_recursive( $data, function( &$v ) {
+      if ( is_bool( $v ) ) {
+        $v = json_encode( $v );
+      }
+    } );
+    // 配列が name[0]=value になるのを避けて、name[]=value にする
+    $str = http_build_query( $data, $numeric_prefix, $arg_separator = null, $encoding_type );
+    $str = preg_replace( '/%5B(?:[0-9]|[1-9][0-9]+)%5D=/', '%5B%5D=', $str );
+    return $str.$cf_list;
   }
 
   protected function send_request( $method, $path, $opts ) {

tests/Unit/HTTP/HttpBuildQueryTest.php

@@ -4,6 +4,7 @@
 
 use tests\TestCase;
 use GuzzleHttp\Client;
+use function Takuya\Utils\array_map_with_key;
 
 class HttpBuildQueryTest extends TestCase {
 
@@ -16,5 +17,18 @@ public function test_http_build_query(){
     $this->assertStringContainsString('names[]=', urldecode($ret));
     $this->assertStringContainsString('あ[0]=', urldecode($ret));
   }
-  
+  public function test_custom_field_for_http_build_query(){
+    $data = ['customField_1234'=>1,'customField_1235'=>['a','b','c'],'customField_1236'=>['あ','い','う']];
+    $cust_array = array_filter($data,fn($v,$k)=>preg_match('/custom/',$k)&&is_array($v),ARRAY_FILTER_USE_BOTH);
+    // 処理
+    $query = join('&',
+      array_map_with_key($cust_array,function($k,$values){
+        return join('&',array_map(fn($v)=> sprintf("%s=%s",urldecode($k),urlencode($v)),$values));
+      }));
+    
+    $this->assertEquals("customField_1235=a&customField_1235=b&customField_1235=c".
+      "&customField_1236=%E3%81%82&customField_1236=%E3%81%84&customField_1236=%E3%81%86",$query);
+    
+    
+  }
 }