预定义常量
下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
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pcntl_sigtimedwaitWaits for signals, with a timeout
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similar_textCalculate the similarity between two strings
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boolvalGet the boolean value of a variable
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curl_multi_closeClose a set of cURL handles
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imap_bodyRead the message body
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mb_strposFind position of first occurrence of string in a string
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pg_send_prepareSends a request to create a prepared statement with the given parameters, without waiting for completion
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swoole_native_socket_bind
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Arr::prependKeysWith
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zend_versionGets the version of the current Zend engine