(PHP 4, PHP 5, PHP 7)
htmlentities — ���ַ�ת��Ϊ HTML ת���ַ�
$string
[, int $flags = ENT_COMPAT | ENT_HTML401
[, string $encoding = ini_get("default_charset")
[, bool $double_encode = true
]]] ) : string�����������涼�� htmlspecialchars() һ���� ���� htmlentities() ��ת�����о��� HTML ʵ����ַ���
���Ҫ���루���������������ʹ�� html_entity_decode()��
string�����ַ���
flags����һ��λ�����ǣ�����������δ������š���Ч�������С�ʹ���ĵ������͡� Ĭ���� ENT_COMPAT | ENT_HTML401��
| ������ | ���� |
|---|---|
ENT_COMPAT |
��ת��˫���ţ���ת�������š� |
ENT_QUOTES |
��ת��˫����Ҳת�������š� |
ENT_NOQUOTES |
��/˫���Ŷ���ת�� |
ENT_IGNORE |
��Ĭ������Ч�Ĵ��뵥Ԫ���У������Ƿ��ؿ��ַ����� ������ʹ�ô˱�ǣ� ��Ϊ��» �����а�ȫӰ���� |
ENT_SUBSTITUTE |
�滻��Ч�Ĵ��뵥Ԫ����Ϊ Unicode �������Replacement Character���� U+FFFD (UTF-8) ���� � (����)�������Ƿ��ؿ��ַ����� |
ENT_DISALLOWED |
Ϊ�ĵ�����Ч������滻Ϊ Unicode �������Replacement Character���� U+FFFD (UTF-8)���� ����������������ǰ���������ԭ���� ������������¾ͺ����ã�Ҫ��֤ XML �ĵ�Ƕ���������ʱ��ʽ�Ϸ��� |
ENT_HTML401 |
�� HTML 4.01 ������롣 |
ENT_XML1 |
�� XML 1 ������롣 |
ENT_XHTML |
�� XHTML ������롣 |
ENT_HTML5 |
�� HTML 5 ������롣 |
encodingAn optional argument defining the encoding used when converting characters.
If omitted, the default value of the encoding varies
depending on the PHP version in use. In PHP 5.6 and later, the
default_charset configuration
option is used as the default value. PHP 5.4 and 5.5 will use
UTF-8 as the default. Earlier versions of PHP use
ISO-8859-1.
Although this argument is technically optional, you are highly encouraged to specify the correct value for your code if you are using PHP 5.5 or earlier, or if your default_charset configuration option may be set incorrectly for the given input.
֧�������ַ�����
| �ַ��� | ���� | ���� |
|---|---|---|
| ISO-8859-1 | ISO8859-1 | ��ŷ��Latin-1 |
| ISO-8859-5 | ISO8859-5 | Little used cyrillic charset (Latin/Cyrillic). |
| ISO-8859-15 | ISO8859-15 | ��ŷ��Latin-9������ŷԪ���ţ�����ͷ�������ĸ�� Latin-1(ISO-8859-1) ��ȱʧ�� |
| UTF-8 | ASCII ���ݵĶ��ֽ� 8 λ Unicode�� | |
| cp866 | ibm866, 866 | DOS ���е���������롣���ַ����� 4.3.2 �汾�еõ�֧�֡� |
| cp1251 | Windows-1251, win-1251, 1251 | Windows ���е���������롣���ַ����� 4.3.2 �汾�еõ�֧�֡� |
| cp1252 | Windows-1252, 1252 | Windows ���е���ŷ���롣 |
| KOI8-R | koi8-ru, koi8r | ������ַ����� 4.3.2 �汾�еõ�֧�֡� |
| BIG5 | 950 | �������ģ���Ҫ�����й�̨��ʡ�� |
| GB2312 | 936 | �������ģ��й����ұ��ַ����� |
| BIG5-HKSCS | �������ģ����������չ�� Big5 �ַ����� | |
| Shift_JIS | SJIS, 932 | ���� |
| EUC-JP | EUCJP | ���� |
| MacRoman | Mac OS ʹ�õ��ַ����� | |
| '' | An empty string activates detection from script encoding (Zend multibyte), default_charset and current locale (see nl_langinfo() and setlocale()), in this order. Not recommended. |
Note: �����ַ���û���Ͽɡ�����ʹ��Ĭ�ϱ��벢�׳��쳣��
double_encode
�ر� double_encode ʱ��PHP ����ת�����е� HTML ʵ�壬
Ĭ����ȫ��ת����
���ر������ַ���
���ָ���ı��� encoding �
string ��������Ч�Ĵ��뵥Ԫ���У�
û������ ENT_IGNORE ����
ENT_SUBSTITUTE ��ǵ�����£��᷵�ؿ��ַ�����
| �汾 | ˵�� |
|---|---|
| 5.6.0 |
The default value for the encoding parameter was
changed to be the value of the
default_charset configuration
option.
|
| 5.4.0 |
encoding ������Ĭ��ֵ�ij� UTF-8��
|
| 5.4.0 |
���ӳ��� ENT_SUBSTITUTE�� ENT_DISALLOWED��
ENT_HTML401�� ENT_XML1��
ENT_XHTML�� ENT_HTML5��
|
| 5.3.0 |
���ӳ��� ENT_IGNORE��
|
| 5.2.3 |
���Ӳ��� double_encode��
|
Example #1 htmlentities() ����
<?php
$str = "A 'quote' is <b>bold</b>";
// ���: A 'quote' is <b>bold</b>
echo htmlentities($str);
// ���: A 'quote' is <b>bold</b>
echo htmlentities($str, ENT_QUOTES);
?>
Example #2 ENT_IGNORE �÷�ʾ��
<?php
$str = "\x8F!!!";
// ����� string
echo htmlentities($str, ENT_QUOTES, "UTF-8");
// ��� "!!!"
echo htmlentities($str, ENT_QUOTES | ENT_IGNORE, "UTF-8");
?>