How To Read a File in Binary Mode

Q

How To Read a File in Binary Mode? - PHP Script Tips - Reading and Writing Files

✍: FYIcenter.com

A

If you have a file that stores binary data, like an executable program or picture file, you need to read the file in binary mode to ensure that none of the data gets modified during the reading process. You need to:

Open the file with fopen($fileName, "rb").
Read data with fread($fileHandle,$length).

Here is a PHP script example on reading binary file:

<?php 
$in = fopen("/windows/system32/ping.exe", "rb");
$out = fopen("/temp/myPing.exe", "w");
$count = 0;
while (!feof($in)) {
  $count++;
  $buffer = fread($in,64);
  fwrite($out,$buffer);
}
fclose($out); 
fclose($in);
print("About ".($count*64)." bytes read.\n"); 
?>

This script will print:

About 16448 bytes read.

This script actually copied an executable program file ping.exe in binary mode to new file. The new file should still be executable. Try it: \temp\myping dev.fyicenter.com.

2007-04-23, 5690👍, 0💬

How To Read One Line of Text from a File
How To Read One Line of Text from a File? - PHP Script Tips - Reading and Writing Files If you have a text file with multiple lines, and you want to read those lines one line at a time, you can use the fgets() function. It reads the current line up to the "\n" character, moves the file pointer to th... 2007-04-22, 5384👍, 0💬

How To Write a String to a File with a File Handle
How To Write a String to a File with a File Handle? - PHP Script Tips - Reading and Writing Files If you have a file handle linked to a file opened for writing, and you want to write a string to the file, you can use the fwrite() function. It will write the string to the file where the file pointer ... 2007-04-23, 5365👍, 0💬

How To Open Standard Output as a File Handle
How To Open Standard Output as a File Handle? - PHP Script Tips - Reading and Writing Files If you want to open the standard output as a file handle yourself, you can use the fopen("php://stdout") function. It creates a special file handle linking to the standard output, and returns the file handle.... 2007-04-23, 5124👍, 0💬

How To Read Data from Keyborad (Standard Input)
How To Read Data from Keyborad (Standard Input)? - PHP Script Tips - Reading and Writing Files If you want to read data from the standard input, usually the keyboard, you can use the fopen("php://stdin") function. It creates a special file handle linking to the standard input, and returns the file h... 2007-04-23, 5118👍, 0💬

How To Append New Data to the End of a File
How To Append New Data to the End of a File? - PHP Script Tips - Reading and Writing Files If you have an existing file, and want to write more data to the end of the file, you can use the fopen($fileName, "a") function. It opens the specified file, moves the file pointer to the end of the file, and... 2007-04-22, 5116👍, 0💬

How To Read One Character from a File
How To Read One Character from a File? - PHP Script Tips - Reading and Writing Files If you have a text file, and you want to read the file one character at a time, you can use the fgetc() function. It reads the current character, moves the file pointer to the next character, and returns the charact... 2007-04-22, 5076👍, 0💬

How To Write a String to a File without a File Handle
How To Write a String to a File without a File Handle? - PHP Script Tips - Reading and Writing Files If you have a string, want to write it to a file, and you don't want to open the file with a file handle, you can use the file_put_contents(). It opens the specified file, writes the specified string... 2007-04-23, 5028👍, 0💬

How To Write an Array to a File without a File Handle
How To Write an Array to a File without a File Handle? - PHP Script Tips - Reading and Writing Files If you have an array, want to write it to a file, and you don't want to open the file with a file handle, you can use the file_put_contents(). It opens the specified file, writes all values from the ... 2007-04-23, 4993👍, 0💬

What's Wrong with "while ($c=fgetc($f)) {}"
What's Wrong with "while ($c=fgetc($f)) {}"? - PHP Script Tips - Reading and Writing Files If you are using "while ($c=fgetc($f)) {}" to loop through each character in a file, the loop may end in the middle of the file when there is a "0" character, because PHP treats "0" as Boolean false. To proper... 2007-04-22, 4939👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.