How to delete specified lines of txt file in php and read txt document data line by line

The example of this article describes the method of PHP deleting specified lines of txt files and reading txt document data line by line. Share it with everyone for your reference, the details are as follows:

Write values ​​to the txt file in a loop:

$keys = range(1,999);
$file = fopen('key_11010000.txt',"w");
foreach($keys as $key){
  fwrite($file,"$key\r\n");
}
fclose($file);
$f1 = fopen('key_11010000.txt','r');
while(!feof($f1)){
  $line=fgets($f1);
  $line = trim($line);
  $arr[] = $line;
}
$keys = array_filter($arr);
var_dump($keys);

Read the txt document data line by line :

$f1 = fopen('key_11010000.txt','r');
while(!feof($f1)){
  $line=fgets($f1);
  $line = trim($line);
  $arr[] = $line;
}
$keys = array_filter($arr);
var_dump($keys);
die;

I hope this article will be helpful to everyone in PHP programming.

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