PHP file programming (2) - four ways to read files

 //Read file
 $file_path="text.txt";
 if(!file_exists($file_path)){
 echo "File does not exist";
 exit();
 }

 //Open the file
 $fp=fopen($file_path,"a+");
 //Read the file
 $content=fread($fp, filesize($file_path));
 echo "The content of the file is:";
 //By default, after the content is output to the web page, it will not be displayed in a new line because the web page does not recognize rn
 //All required Put rn =>

 $content=str_replace("rn","",$content);
 echo $content;
 fclose($fp);
?>

2. The second way to read files

 //The second way to read files
 $file_path="text.txt";
 if(!file_exists ($file_path)){
 echo "File does not exist";
 exit();
 }
 $content=file_get_contents($file_path);
 $content=str_replace("rn", "",$content);
 echo $content;
?>

3. How to read in a loop (to deal with large files)

 //The third reading method, loop reading (for large files)
 $file_path="text.txt ";
 if(!file_exists($file_path)){
 echo "The file does not exist";
 exit();
 }
 //Open the file
 $fp=fopen($file_path ,"a+");
 //Define how many bytes to read each time
 $buffer=1024;
 //Read simultaneously. Determine whether the end of the file is reached while(!feof($fp)){
 //Read data in 1024 bytes
 $content=fread($fp,$buffer);
 echo $content;
 }< /p>
 fclose($fp);
?>

4. Read the ini configuration file 1), db.ini file

 $arr=parse_ini_file("db.ini");
 echo "";
 print_r($arr);
 echo "";

 echo $arr['host'];
 //Connect to the database
 $conn = mysql_connect($arr['host'], $arr['user'] , $arr['pwd']);
 if(!$conn){
 echo "error";
 }
 echo "OK";
?>