Checks if a field exists in the document

# SolrDocument::fieldExists

(PECL solr >= 0.9.2)

SolrDocument::fieldExists — Checks if a field exists in the document

### 说明

public function SolrDocument::fieldExists(string `$fieldName`): bool

Checks if the requested field as a valid fieldname in the document.

### 参数

`fieldName`

  The name of the field.

### 返回值

Returns `true` if the field is present and `false` if it does not.

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