PHP clears the file after reading the file content sample code_PHP tutorial

Copy code The code is as follows:

$fh = fopen($path, "r+");

if( flock($fh, LOCK_EX) ){//Add write lock
$old_content=json_decode(fread($fh,filesize($path)),true);

$old_content=$old_content.$ new_content;
ftruncate($fh,0); // Truncate the file to the given length
rewind($fh); // Rewind the position of the file pointer
fwrite($fh,json_encode( $old_content));
// @chmod($path,0644);
flock($fh, LOCK_UN); //Unlock

}
fclose($fh);

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