PHP file locking ensures multi-threaded writing safety

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[php] view plain copy function write_file($filename, $content) { $lock = $filename . '.lck'; $write_length = 0; while(true) { if( file_exists($lock) ) { usleep(100); } else { touch($lock); $write_length = file_put_contents($filename, $content, FILE_APPEND); break; } } if( file_exists($lock) ) { unlink($lock); } return $write_length; }

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