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1.Îļþ¼ÓËø²Ù×÷

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bool flock ( resource $handle , int $operation [, int &$wouldblock ] )

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LOCK_SH – ¹²ÏíËø£¬¶à¸öÀú³Ì¿Éͬʱ»ñÈ¡Ëø£¬µ«Ö»ÄܶÁ²»¿Éд¡£

LOCK_EX – ÅÅËûËø£¬Ö»ÓÐÒ»¸öÀú³Ì¿ÉÒÔ»ñÈ¡Ëø£¬¿ÉÒÔ¶ÁÒ²¿ÉÒÔд¡£

LOCK_UN – ÊÍ·ÅËø¡£

LOCK_NB – ÈôÊDz»Ï£Íûflockº¯ÊýÔÚ»ñÈ¡Ëøʱ¹£Èû£¬¿ÉÒÔÔÚ²Ù×÷²ÎÊýÖмÓÉÏLOCK_NB¡£

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$file_path = '/path/to/file.txt';
$file_handle = fopen($file_path, 'a+');
if (flock($file_handle, LOCK_EX)) {
   //ÔÚ´Ë´¦¾ÙÐÐÎļþд²Ù×÷ 
   flock($file_handle, LOCK_UN); //½âËøÎļþ
}
fclose($file_handle);

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flock($file_handle, LOCK_UN);

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