PHP file Operations (1)--open/Read files

1. Open File (fopen)

Syntax:resource $fp =fopen (file address, mode), returns the file pointer (filename pointer)

Mode	Meaning
R	Read-only
W	Write (empty rewrite)
A	Additional

$fp fopen ('./aa.txt ', ' R ');   // Read-only $fp fopen ('./aa.txt ', ' W ');   // write (empty rewrite) $fp fopen ('./aa.txt ', ' a ');   // Append

2. Read the file ( fread,file_get_contents)

Syntax:string fread ($fp , File size )

File_get_contents to read the entire file into a string

Syntax:string file_get_contents ( string $filename)

<?PHP$filename= './aa.txt ';Echo"<br><br>****** first method of reading ********<br>";$fp=fopen($filename, "R");$con=fread($fp,filesize($filename));//by default, the content displayed to a Web page is not wrapped, and you need to replace the line break \ r \ <br/>$con=Str_replace("\ r \ n", "<br/>",$con);Echo"$con";//Close Pointerfclose($fp);Echo"<br><br>****** Second Read method, loop read (for large files) ********<br>";$fp=fopen($filename, "R");//set Buffer to read 1024 bytes at a time$buffer= 1024;//determine if the file pointer is at the end of the file while(!feof($fp)) {    //Read    $con=fread($fp,$buffer); //Replace line break    $con=Str_replace("\ r \ n", "<br/>",$con); Echo"$con";}//Close Pointerfclose($fp);Echo"<br><br>****** third method of reading ********<br>";$con=file_get_contents($filename);//Replace line break$con=Str_replace("\ r \ n", "<br/>",$con);Echo"$con";

Results:

3.fgets (): Reads a line and moves the pointer down one line

$filename = "Aa.txt", $fp = fopen ($filename, ' R '), while (!feof ($fp)) {echo fgets ($fp). " <br/> ";}

Results:

$filename = "Aa.txt"; fseek ($fp, 0);  Move the file pointer to the front of the file while (!feof ($fp)) {echo fgets ($fp). " <br/> ";}

Results:

4.GETC (): Gets a character

$filename = "Aa.txt"; $fp = fopen ($filename, ' R '), while (!feof ($fp)) {//Gets a Chinese character, consumes 3 bytes of echo fqetc ($FP). " <br/> ";}

　　

PHP file Operations (1)--open/Read files