Basic operations on PHP files

//Basic file operations
//fopen()
Open a file
//Open a file using an absolute path, select read-only mode, and return the resource $handle
$handle= fopen("D:/lamp/apache2/htdocs/test/file.txt","r");
//Access files in the document root directory and also select read-only mode
$handle=fopen($_SERVER[' DOCUMENT_ROOT']."/test/file.txt","r");
//Open remote files, which can only be opened in read mode using the http protocol
$handle=fopen("http://www.wowsai. com","r");
//Use FTP protocol to open remote files. If the FTP server is writable, it can be opened in write mode
//$handle=fopen("ftp://user:password@example. com/file.txt",'w');
//fclose()
Close the open resource type
//fwrite()
Write content to the file
$fileName="data.txt";
// Declare a file variable
//Open the file in write-only mode, create it if it does not exist, and pass the program when the opening fails
$f_handle=fopen("data.txt","w")or die("Open".$fileName."File failed");
for($i=0;$i//Add content to the file through a loop
fwrite ($f_handle,"againn");
}
fclose($f_handle);
//Close the open file
//file_put_contents()
Write all data to the specified file at once
//Read the file content
//fread()
Read an open file
//file_get_contents()
Read a file into a string
//fgets()
Return a line from an open file
//fgetc()
From an open file Return characters in
//file()
Read the file into an array
//readfile()
Read a file and output it to the output buffer
//feof()
Judge whether a file pointer is at the end of the file At
//Read the specified number of bytes from the file and store it in a variable
$fileName2="data.txt";
$f_hand=fopen($fileName2,"r")or die("Open the file Failed");
$contents=fread($f_hand,50);
fclose($f_hand);
echo $contents."";
//Read all the contents from the file and store them in a variable , read part of it each time, read in a loop
/* $fileName3="D:/lamp/apache2/icons/link.gif";
//Save the file name of the binary file into a variable
$f3_handle= fopen($fileName3,"rb")or die("File opening failed"); //Open the file in read-only mode, the mode is added with "b"
$f3_contents="";
//Declare one for saving String of file content
while(!feof($f3_handle)){
//Loop to read the contents of the file until the end of the file
$f3_contents.=fread($f3_handle,1024);
//Read each time 1024 characters
}
fclose($f3_handle);
echo $f3_contents; */
//Another way to read the entire contents of the file
$fileName4="data.txt";
$f4_handle=fopen($fileName4 ,"r")or die("File opening failed");
$f4_con=fread($f4_handle,filesize($fileName4));
//Use filesize to get the length of the file, so as to read the entire content of the file
 fclose($f4_handle);
echo $f4_con."";
//Another method to read the entire contents of the file, which has much better performance than the above
echo file_get_contents("data.txt");
$f5_handle=fopen("data.txt","r") or die("File opening failed");
while(!feof($f5_handle)){
//Determine whether the pointer reaches the end of the file
$buffer= fgets($f5_handle);
//Read one line from the file at a time
echo $buffer."";
}
fclose($f5_handle);
$f6_handle=fopen("data.txt", "r") or die("File opening failed");
while(!feof($f6_handle)){
//Judge whether the pointer reaches the end of the file
$buffer=fgetc($f6_handle);
//Every time from Read a character from the file
echo $buffer."";
}
fclose($f6_handle);
print_r(file("data.txt"));
//Read the file into an array
readfile("data.txt");
//Read the contents of the file directly and output it to the browser
//Access remote files
Make sure "allow_url_fopen" in php.ini is turned on, and make sure The remote file has access permission
$ws_file=fopen("http://www.wowsai.com","r")or die("Remote file opening failed");
//Open the remote file
while(!feof( $ws_file)){
$ws_line=fgets($ws_file);
if(preg_match("/(.*)/",$ws_line,$res)){
//Use Regularly matches the title of the website
$title=$res[1];
break;
}
}
fclose($ws_file);
echo $title."";
//Move the pointer of the file
//ftell()
Return the current position of the pointer
//fseek()
Move the pointer to the specified Position
//rewind()
Move the pointer to the beginning of the file
$fp=fopen("data.txt","r") or die("File opening failed");
//Open the file in read-only mode
 echo ftell($fp)."";
//Output the position of the pointer when the file was just opened. The default is 0
echo fread($fp,10)."";
// After reading the first 10 characters of the file, the file pointer has changed
echo ftell($fp)."";
//After reading the first 10 characters of the file, the file pointer has reached position 10
fseek ($fp,30,SEEK_CUR);
//Move the file pointer backward 30 characters
echo ftell($fp)."";
//After moving the file 30 characters, it reaches 40 Position
echo fread($fp,10)."";
//Read characters between 40 and 50, the pointer will reach 50
fseek($fp,-10,SEEK_END);
// Set the pointer to the 10th position from the bottom of the file
echo fread($fp,10)."";
//Output the last 10 characters of the file
rewind($fp);
//Set the file pointer To the beginning of the file
echo ftell($fp);
//The file pointer returns to the beginning, so 0
fclose($fp);
?>

PHP