PHP Programing language

bin2hex()

The bin2hex() function converts a string of ASCII characters to hexadecimal values. The string again converted back by using the pack() function.

bin2hex(string)

Example:

<?php 
$str = bin2hex("Gud Morning India!");
echo($str); 
?>

Output:

pack()

The pack() function packs data into a binary string.

pack(format,args+)

In above syntax, "args+" specifies one or more arguments to be packed and format is as fallows:

• a - NUL-padded string
• A - SPACE-padded string
• h - Hex string, low nibble first
• H - Hex string, high nibble first
• c - signed char
• C - unsigned char
• s - signed short (always 16 bit, machine byte order)
• S - unsigned short (always 16 bit, machine byte order)
• n - unsigned short (always 16 bit, big endian byte order)
• v - unsigned short (always 16 bit, little endian byte order)
• i - signed integer (machine dependent size and byte order)
• I - unsigned integer (machine dependent size and byte order)
• l - signed long (always 32 bit, machine byte order)
• L - unsigned long (always 32 bit, machine byte order)
• N - unsigned long (always 32 bit, big endian byte order)
• V - unsigned long (always 32 bit, little endian byte order)
• f - float (machine dependent size and representation)
• d - double (machine dependent size and representation)
• x - NUL byte
• X - Back up one byte
• Z - NUL-padded string
• @ - NUL-fill to absolute position

Example:

<?php
$str = "Gud Morning!";
echo bin2hex($str) . "<br>";
echo pack("H*",bin2hex($str)) . "<br>";
?>  

Output:

477564204d6f726e696e6721
Gud Morning!