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PHP function bin2hex() that converts a string of ASCII characters into a hexadecimal value
- PHP中文网Original
- 2017-11-01 10:28:063003browse
Convert "Hello World!" to a hexadecimal value:
<?php
$str = bin2hex("Hello World!");
echo($str);
?>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)
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($str)) . "<br>";
?>//php中有 bin2hex方法，但没有 hex2bin方法，以下简单实现 hex2bin ：
<?php
function hex2bin($data) {
$len = strlen($data);
return pack("H" . $len, $data); }
?>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)
}
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't forget the meeting!</body> </note>
PHP code:
<?php
$xml = simplexml_load_file("test.xml");
$xml->body[0]->addAttribute("type", "small");
foreach($xml->body[0]->attributes() as $a => $b)
{
echo $a,'="',$b,'"';
}
?>Output:
type="small"
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