在 PHP 7.4 中报错：header() expects at least 1 parameter, 0 given （is_callable(‘Header’) 为 true）
1、在 PHP 7.4 中报错：header() expects at least 1 parameter, 0 given。如图1
图1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | { "errors": [ { "debugMessage": "header() expects at least 1 parameter, 0 given", "message": "Internal server error", "extensions": { "category": "internal" }, "locations": [ { "line": 5, "column": 7 } ], "path": [ "onlineStoreSession", "versionedOnlineStore", "theme" ], "trace": [ { "file": "E:\\wwwroot\\object\\Modules\\OnlineStoreThemeGraphQl\\Resolver\\OnlineStoreThemeResolver.php", "line": 96, "function": "header()" }, { "call": "Modules\\OnlineStoreThemeGraphQl\\Resolver\\OnlineStoreThemeResolver::Modules\\OnlineStoreThemeGraphQl\\Resolver\\{closure}(array(4), 'name')" } ] } ], "data": { "onlineStoreSession": { "versionedOnlineStore": { "theme": null } } }} |
2、查看具体的代码实现
1 2 3 4 5 6 7 8 9 | $fields = array_keys($resolveInfo->getFieldSelection());return array_reduce($fields, function($carry, $field) use($fieldResolvers){ if (isset($fieldResolvers[$field])) { $carry[$field] = is_callable($fieldResolvers[$field])? $fieldResolvers[$field](): $fieldResolvers[$field]; } return $carry;}, []); |
3、打印 $fields ，结果如下
1 2 3 | $fields = array_keys($resolveInfo->getFieldSelection());print_r($fields);exit; |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | Array( [0] => id [1] => editable [2] => createdAt [3] => editedAt [4] => name [5] => role [6] => previewable [7] => url [8] => themeStoreThemeId [9] => metadata [10] => presets [11] => themeSettingsCategories) |
4、添加判断，当 $field 等于 name 时，打印 $fieldResolvers[$field]、is_callable($fieldResolvers[$field])
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | $fields = array_keys($resolveInfo->getFieldSelection());return array_reduce($fields, function($carry, $field) use($fieldResolvers){ if (isset($fieldResolvers[$field])) { if ($field == 'name') { var_dump($fieldResolvers[$field]); var_dump(is_callable($fieldResolvers[$field])); exit; } $carry[$field] = is_callable($fieldResolvers[$field])? $fieldResolvers[$field](): $fieldResolvers[$field]; } return $carry;}, []); |
1 2 | string(6) "Header"bool(true) |
5、is_callable — 验证值是否可以在当前范围内作为函数调用。is_callable(‘Header’) 为 true，因为调用了 header() — 发送原生 HTTP 头，参数是必填的，进而报错。instanceof 用于确定一个 PHP 变量是否属于某一类 class 的实例。Closure 用于代表 匿名函数 的类。调整为 $fieldResolvers[$field] instanceof \Closure 后，不再报错。
1 2 3 4 5 6 7 8 9 | $fields = array_keys($resolveInfo->getFieldSelection());return array_reduce($fields, function($carry, $field) use($fieldResolvers){ if (isset($fieldResolvers[$field])) { $carry[$field] = ($fieldResolvers[$field] instanceof \Closure) ? $fieldResolvers[$field](): $fieldResolvers[$field]; } return $carry;}, []); |
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