Basic operation of PHP files

Basic operation of the file fopen () Open a file Open a file with an absolute path, select Read-only mode, and return the resource $handle $handle =fopen ("D:/lamp/apache2/htdocs/test/file.txt", "R"); Access files under the root of the document, and also select Read-only mode $handle =fopen ($_server[' document_root '). " /test/file.txt "," R "); Open a remote file and use the HTTP protocol to open it in a read-only manner $handle =fopen ("http://www.wowsai.com", "R"); Open a remote file using the FTP protocol, if the FTP server is writable, you can open it in write mode $handle =fopen ("Ftp://user:password@example.com/file.txt", ' W '); Fclose () To close an open resource type Fwrite () Writing content to a file $fileName = "Data.txt"; Declaring a variable for a file Open a file in a write-only manner, not created, and passed through the program when the open fails $f _handle=fopen ("Data.txt", "w") or Die ("open ". $fileName. " File failed "); for ($i =0; $i <10; $i + +) { Add content to a file through a loop Fwrite ($f _handle, "again\n"); } Fclose ($f _handle); Close an open file File_put_contents () Writes all data to the specified file at once Read File contents Fread () Read an open file File_get_contents () To read a file into a string Fgets () Returns a row from an open file FGETC () Returning characters from an open file File () To read a file into an array ReadFile () Reads a file and outputs it to the output buffer Feof () Determines whether a file pointer is at the end of the file Reads the contents of a specified number of bytes from a file into a variable $fileName 2= "Data.txt"; $f _hand=fopen ($fileName 2, "R") or Die ("File open failed"); $contents =fread ($f _hand,50); Fclose ($f _hand); echo $contents. " "; Reads everything from a file into a variable, reads one part at a time, loops through /* $fileName 3= "d:/lamp/apache2/icons/link.gif"; Save the file name of the binaries in a variable $f 3_handle=fopen ($fileName 3, "RB") or Die ("File open failed"); Open the file in read-only mode with "B" added $f 3_contents= ""; Declares a string to hold the contents of the file while (!feof ($f 3_handle)) { Loop through the contents of the file, knowing the end of the file $f 3_contents.=fread ($f 3_handle,1024); Reads 1024 characters at a time } Fclose ($f 3_handle); echo $f 3_contents; */ Another way to read the entire contents of a file $fileName 4= "Data.txt"; $f 4_handle=fopen ($fileName 4, "R") or Die ("File open failed"); $f 4_con=fread ($f 4_handle,filesize ($fileName 4)); Use FileSize to get the length of the file so that it reads the entire contents of the file Fclose ($f 4_handle); echo $f 4_con. " "; Another way to read the entire contents of a file is much better than the performance above Echo file_get_contents ("Data.txt"); $f 5_handle=fopen ("Data.txt", "R") or Die ("File open failed"); while (!feof ($f 5_handle)) { Determine if the pointer is to the end of the file $buffer =fgets ($f 5_handle); Every time a row is read from a file echo $buffer. " "; } Fclose ($f 5_handle); $f 6_handle=fopen ("Data.txt", "R") or Die ("File open failed"); while (!feof ($f 6_handle)) { Determine if the pointer is to the end of the file $buffer =fgetc ($f 6_handle); Each time a character is read from a file echo $buffer. " "; } Fclose ($f 6_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 accessing remote Files Ensure that "Allow_url_fopen" in PHP.ini is turned on and that the remote file has access rights $ws _file=fopen ("http://www.wowsai.com", "R") or Die ("Remote File Open failed"); Open a remote file while (!feof ($ws _file)) { $ws _line=fgets ($ws _file); if (Preg_match ("/(. *) <\/title>/", $ws _line, $res)) { Use regular match titles for Web sites $title = $res [1]; Break } } Fclose ($ws _file); echo $title. " "; Move a pointer to a file Ftell () Returns the current position of the pointer Fseek () Move the pointer to the specified position Rewind () Move the pointer to the beginning of the file $FP =fopen ("Data.txt", "R") or Die ("File open failed"); Open a file with read-only mode Echo Ftell ($fp). " "; Outputs the position of the pointer when the file was just opened, default is 0 Echo fread ($FP, 10). " "; Read the first 10 characters of a file, the file pointer has changed Echo Ftell ($fp). " "; After reading 10 characters of the file, the pointer to the file is in the 10 position Fseek ($fp, 30,seek_cur); Move the pointer of a file backwards by 30 characters Echo Ftell ($fp). " "; The file moved 30 characters, to the 40 position Echo fread ($FP, 10). " "; Reads a character from 40 to 50, and the pointer moves to 50 Fseek ($fp, -10,seek_end); Set the pointer to the 10th of the file's penultimate position Echo fread ($FP, 10). " "; The last 10 characters of the output file Rewind ($FP); Set the file pointer to the beginning of the file Echo Ftell ($FP); The pointer to the file goes back to the beginning, so it outputs 0 Fclose ($FP); ?> Copy Code

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