php file writing

For example, the file we want to operate is demo.txt

One way is

$file = fopen('demo.txt','a');

$content = 'xxxxxxxx';

fwrite($file ,$content);

fclose($file);

Sometimes files are written and written frequently to prevent writing failures. You can use

flock($file,LOCK_EX);

flock($file,LOCK_UN) ;

Another way

use file_put_contents();

if(file_exists('demo.txt')){

                                                                           txt' ;
$fcontent = $str."rn";
file_put_contents($fp,$fcontent,FILE_APPEND | LOCK_EX);
}else{
echo 'the file does not exist';
}
It should be noted that the file path to be written is an absolute path, which can be obtained by using __FILE__

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