PHP function bin2hex() that converts a string of ASCII characters into a hexadecimal value-PHP Tutorial-php.cn

PHP function bin2hex() that converts a string of ASCII characters into a hexadecimal value

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Release： 2023-03-16 21:18:02

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Convert "Hello World!" to a hexadecimal value:

<?php 
$str = bin2hex("Hello World!");
echo($str); 
?>

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Definition and usage

bin2hex() function converts a string of ASCII characters into a hexadecimal value . Strings can be converted back using the pack() function.

Syntax

bin2hex(string)

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Parameters Description

string Required. Specifies the string to be converted.

Technical details Return value:

Returns the hexadecimal value of the string to be converted.

Convert a string value from binary to hexadecimal, and then convert it back:

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

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//php中有 bin2hex方法，但没有 hex2bin方法，以下简单实现 hex2bin ：
<?php
function hex2bin($data) {
     $len = strlen($data);
     return pack("H" . $len, $data); } 
?>

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The function of PHP bin2hex() is to convert a string of ASCII characters to hexadecimal system value.

bin2hex definition and usage

addAttribute() function adds an attribute to the SimpleXML element.

This function has no return value.

Syntax

class SimpleXMLElement
{
string addAttribute(name,value,ns)
}

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Parameters Description

name Required. Specifies the name of the attribute.

value Required. Specifies the value of the attribute.

ns Optional. Specifies the namespace of the attribute.

bin2hex example

XML file:

<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>George</to>
<from>John</from>
<heading>Reminder</heading>
<body>Don&#39;t forget the meeting!</body>
</note>

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PHP code:

<?php
$xml = simplexml_load_file("test.xml");
$xml->body[0]->addAttribute("type", "small");
foreach($xml->body[0]->attributes() as $a => $b)
  {
  echo $a,&#39;="&#39;,$b,&#39;"&#39;;
  }
?>

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Output:

type="small"

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